Doepfer

Hi! I'm thinking about getting an A-127 Triple VC Resonance Filter for my system, and as I tend to use a lot of LFOs for slow sweeps of different parameters, I got the idea of bringing out the 3 internal LFOs of the A-127 to separate jacks on a 4HP blind panel next to the module. This would give the A-127 a second function as a simple "triple triangle LFO" when not used as a filter. Would this be as easy as just taking the signals from the switched terminals of the ext. CV jacks on the A-127? Is there anything more I should do, like using output protection resistors? 

Also, does anyone know/have a good demo of the A-127?

Thanks for your help!

/Henrik Medquist

Hello,
A friend of mine did something like that with his A127.
He said it is no problem to get the output directly from the place on the
board where the LFO outputs.
I myself don't own one so I don't know if you can use the switched
terminals.. But this seems a good place to me.

My friend also mentioned he rebuild the module so you can have 3 seperate
inputs for all the 3 filters.
He has a quite small system and gained a lot of extra bang from his system
this way.

Greetings,

Ernst






On Sun, Jan 18, 2009 at 9:19 PM, Henrik Medquist <longforparade@yahoo.com>wrote:

>   Hi! I'm thinking about getting an A-127 Triple VC Resonance Filter for
> my system, and as I tend to use a lot of LFOs for slow sweeps of different
> parameters, I got the idea of bringing out the 3 internal LFOs of the A-127
> to separate jacks on a 4HP blind panel next to the module. This would give
> the A-127 a second function as a simple "triple triangle LFO" when not used
> as a filter. Would this be as easy as just taking the signals from the
> switched terminals of the ext. CV jacks on the A-127? Is there anything more
> I should do, like using output protection resistors?
>
> Also, does anyone know/have a good demo of the A-127?
>
> Thanks for your help!
>
> /Henrik Medquist
>
>  
>


[Non-text portions of this message have been removed]

> Hi! I'm thinking about getting an A-127 Triple VC Resonance
> Filter for my system, and as I tend to use a lot of LFOs for slow
> sweeps of different parameters, I got the idea of bringing out
> the 3 internal LFOs of the A-127 to separate jacks on a 4HP blind
> panel next to the module. This would give the A-127 a second
> function as a simple "triple triangle LFO" when not used as a
> filter. Would this be as easy as just taking the signals from the
> switched terminals of the ext. CV jacks on the A-127? Is there
> anything more I should do, like using output protection resistors?
>
> Also, does anyone know/have a good demo of the A-127?
>
> Thanks for your help!
>
> /Henrik Medquist

The LFO outputs are available at pin 7 (triangle) and pin 8 (rectangle) of
the TL084. 1k protection resistors should be used to connect these pins to
the additional sockets. And a simple voltage divider made of two resistors
is recommended for the rectangle output because pin 8 outputs about +/-11V
(i.e. ~ 22V overall voltage level).

Best wishes
Dieter Doepfer

do the filters self oscillate (as both lp and bp)? if so, you've then
got six lfo's if the filters aren't being used.

and can anyone tell me how good the tracking at 1v/oct is? i tend to
use a lot of filters as oscillators, and i've been eyeing this module
for a while.

thanks, stu

--- In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:
>
> > Hi! I'm thinking about getting an A-127 Triple VC Resonance
> > Filter for my system, and as I tend to use a lot of LFOs for slow
> > sweeps of different parameters, I got the idea of bringing out
> > the 3 internal LFOs of the A-127 to separate jacks on a 4HP blind
> > panel next to the module. This would give the A-127 a second
> > function as a simple "triple triangle LFO" when not used as a
> > filter. Would this be as easy as just taking the signals from the
> > switched terminals of the ext. CV jacks on the A-127? Is there
> > anything more I should do, like using output protection resistors?
> >
> > Also, does anyone know/have a good demo of the A-127?
> >
> > Thanks for your help!
> >
> > /Henrik Medquist
> 
> The LFO outputs are available at pin 7 (triangle) and pin 8
(rectangle) of
> the TL084. 1k protection resistors should be used to connect these
pins to
> the additional sockets. And a simple voltage divider made of two
resistors
> is recommended for the rectangle output because pin 8 outputs about
+/-11V

> (i.e. ~ 22V overall voltage level).
> 
> Best wishes
> Dieter Doepfer
>

> do the filters self oscillate (as both lp and bp)? if so, you've then
> got six lfo's if the filters aren't being used.
>
> and can anyone tell me how good the tracking at 1v/oct is? i tend to
> use a lot of filters as oscillators, and i've been eyeing this module
> for a while.
>
> thanks, stu

The A-127 does not self oscillate as resonance filters usually do not have
this feature. And the CV inputs are not trimmed for 1V/oct as the main
application of the A-127 is the frequency control via the internal LFOs.
That's why we didn't turn our attention to 1V/oct scaling of the frequency
control inputs. The module is adjusted so that the internal LFO covers the
whole frequency range when the manual frequency control is in the center
position and the CV amplitude control is fully clockwise. But you could
adjust the trimming potentiometer P7 to obtain 1V/oct scaling of the CV
input.

To obtain self oscillation the module has to be modified a bit: a resistor
in the filter circuit has to be changed. I'll have  to try out which one
(probably R13, but I'm not sure).

This information is valid only for the new version of A-127 with CA3080 OTAs
(manufactured since 2001). For the old version (with CEM3382) it's mroe
difficult because there is no trimming potentiometer for the CV scale
available. In this case a resistor of the CV summing amplifier has to be
replaced by the combination of a resistor and trimming potentiometer to be
able to adjust the scale.

Best wishes
Dieter Doepfer

Hello,

I am a very new user to the euro world and have a couple modules so far but recently got an A-112 second hand.  My time with it has only been about 1 hour so far but was wondering if it is possible to record CV data as opposed to audio.  It seems like I was able to get quick swells from a slew-as-envelope but when I slowed  the timing down it didn't seem to work.  I am currently waiting on some proper lfo/adsr to fully test it but wanted to see if any of you have any info.  Likewise, if it is not set-up to do so currently is there a possible mod to allow CV recording?

Thanks,
b.
 
	 
	
	








	


	
	

[Non-text portions of this message have been removed]

This seems to be the holy grail to modular users lately. All the  
interest in the MOTU Volta which turns many DC-couples Audio  
interfaces into CV-output devices. Currently the only commercial  
products that record continuous CV data (not just note data) are in  
the scientific world used for data recording. These are usually very  
expensive machines. I would imagine the interest that the Volta has  
stirred up would mean that some sort of device would pop up soon on  
the market. All it would take is a audio interface that can handle the  
voltage swing of a modular and had DC-coupled inputs. It won't be long  
I'm sure.
-James

On Jan 22, 2009, at 1:25 PM, brian wrote:

> Hello,
>
> I am a very new user to the euro world and have a couple modules so  
> far but recently got an A-112 second hand.  My time with it has only  
> been about 1 hour so far but was wondering if it is possible to  
> record CV data as opposed to audio.  It seems like I was able to get  
> quick swells from a slew-as-envelope but when I slowed  the timing  
> down it didn't seem to work.  I am currently waiting on some proper  
> lfo/adsr to fully test it but wanted to see if any of you have any  
> info.  Likewise, if it is not set-up to do so currently is there a  
> possible mod to allow CV recording?
>
> Thanks,
> b.
>
>
>
>
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
> 



[Non-text portions of this message have been removed]

I have been seeing all the buzz for the volta thing which you could do with max/msp as well if you have the dc coupled interface, but I was hoping for something that is computer free.  Modcan has their CV recorder module and I was hoping the A-112 could do a simpler version as an additional 'extra' feature.  No need for anything as elaborate as the Modcan unit but being able to record a more complex gesture(joystick, ect..) which could then be triggered at a later time would be nice. 

thanks,
b.

--- On Thu, 1/22/09, James Husted <ersatzplanet@mac.com> wrote:

From: James Husted <ersatzplanet@mac.com>
Subject: Re: [Doepfer_a100] a-112 - cv recording?
To: Doepfer_a100@yahoogroups.com
Date: Thursday, January 22, 2009, 3:38 PM










    
            This seems to be the holy grail to modular users lately. All the  

interest in the MOTU Volta which turns many DC-couples Audio  

interfaces into CV-output devices. Currently the only commercial  

products that record continuous CV data (not just note data) are in  

the scientific world used for data recording. These are usually very  

expensive machines. I would imagine the interest that the Volta has  

stirred up would mean that some sort of device would pop up soon on  

the market. All it would take is a audio interface that can handle the  

voltage swing of a modular and had DC-coupled inputs. It won't be long  

I'm sure.

-James



On Jan 22, 2009, at 1:25 PM, brian wrote:



> Hello,

>

> I am a very new user to the euro world and have a couple modules so  

> far but recently got an A-112 second hand.  My time with it has only  

> been about 1 hour so far but was wondering if it is possible to  

> record CV data as opposed to audio.  It seems like I was able to get  

> quick swells from a slew-as-envelope but when I slowed  the timing  

> down it didn't seem to work.  I am currently waiting on some proper  

> lfo/adsr to fully test it but wanted to see if any of you have any  

> info.  Likewise, if it is not set-up to do so currently is there a  

> possible mod to allow CV recording?

>

> Thanks,

> b.

>

>

>

>

>

>

>

>

>

>

> [Non-text portions of this message have been removed]

>

>

> 



[Non-text portions of this message have been removed]




      

    
    
	
	 
	
	








	


	
	

[Non-text portions of this message have been removed]

Hey Guys, I am pretty sure that the Harvestman Tyme Serfari will record 
CVs. Mine has not yet arrived, so I am not able to test this...

The A-112 is AC coupled, and thus slow changing voltages will not be 
passed. Check the archives for further details, I myself have asked this 
very question, as have others I am sure.

On thing to try with the A-112 is to create a noise loop with it, apply 
the output to a sample and hold and use  the output from the sample and 
hold as a CV source. This will yield predictable randomness???

Tony

James Husted wrote:

>
> This seems to be the holy grail to modular users lately. All the
> interest in the MOTU Volta which turns many DC-couples Audio
> interfaces into CV-output devices. Currently the only commercial
> products that record continuous CV data (not just note data) are in
> the scientific world used for data recording. These are usually very
> expensive machines. I would imagine the interest that the Volta has
> stirred up would mean that some sort of device would pop up soon on
> the market. All it would take is a audio interface that can handle the
> voltage swing of a modular and had DC-coupled inputs. It won't be long
> I'm sure.
> -James
>
> On Jan 22, 2009, at 1:25 PM, brian wrote:
>
> > Hello,
> >
> > I am a very new user to the euro world and have a couple modules so
> > far but recently got an A-112 second hand. My time with it has only
> > been about 1 hour so far but was wondering if it is possible to
> > record CV data as opposed to audio. It seems like I was able to get
> > quick swells from a slew-as-envelope but when I slowed the timing
> > down it didn't seem to work. I am currently waiting on some proper
> > lfo/adsr to fully test it but wanted to see if any of you have any
> > info. Likewise, if it is not set-up to do so currently is there a
> > possible mod to allow CV recording?
> >
> > Thanks,
> > b.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
>

The tyme sefari's ok for limited CV recording, like gestures, LFOs,
etc.  But I wouldn't say it's a CV recorder, that's just a bonus.

On Thu, Jan 22, 2009 at 2:04 PM, Tony Rolando <tony@makenoisemusic.com> wrote:
> Hey Guys, I am pretty sure that the Harvestman Tyme Serfari will record
> CVs. Mine has not yet arrived, so I am not able to test this...
>
> The A-112 is AC coupled, and thus slow changing voltages will not be
> passed. Check the archives for further details, I myself have asked this
> very question, as have others I am sure.
>
> On thing to try with the A-112 is to create a noise loop with it, apply
> the output to a sample and hold and use the output from the sample and
> hold as a CV source. This will yield predictable randomness???
>
> Tony
>
> James Husted wrote:
>>
>> This seems to be the holy grail to modular users lately. All the
>> interest in the MOTU Volta which turns many DC-couples Audio
>> interfaces into CV-output devices. Currently the only commercial
>> products that record continuous CV data (not just note data) are in
>> the scientific world used for data recording. These are usually very
>> expensive machines. I would imagine the interest that the Volta has
>> stirred up would mean that some sort of device would pop up soon on
>> the market. All it would take is a audio interface that can handle the
>> voltage swing of a modular and had DC-coupled inputs. It won't be long
>> I'm sure.
>> -James
>>
>> On Jan 22, 2009, at 1:25 PM, brian wrote:
>>
>> > Hello,
>> >
>> > I am a very new user to the euro world and have a couple modules so
>> > far but recently got an A-112 second hand. My time with it has only
>> > been about 1 hour so far but was wondering if it is possible to
>> > record CV data as opposed to audio. It seems like I was able to get
>> > quick swells from a slew-as-envelope but when I slowed the timing
>> > down it didn't seem to work. I am currently waiting on some proper
>> > lfo/adsr to fully test it but wanted to see if any of you have any
>> > info. Likewise, if it is not set-up to do so currently is there a
>> > possible mod to allow CV recording?
>> >
>> > Thanks,
>> > b.
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > [Non-text portions of this message have been removed]
>> >
>> >
>> >
>>
>> [Non-text portions of this message have been removed]
>>
>>
>
>

Oh yeah, for certain... the original poster mentioned something about 
recording a joystick motion or the like... I was guessing it would be 
good for that task.

Tony

Don Kim wrote:

>
> The tyme sefari's ok for limited CV recording, like gestures, LFOs,
> etc. But I wouldn't say it's a CV recorder, that's just a bonus.
>
> On Thu, Jan 22, 2009 at 2:04 PM, Tony Rolando <tony@makenoisemusic.com 
> <mailto:tony%40makenoisemusic.com>> wrote:
> > Hey Guys, I am pretty sure that the Harvestman Tyme Serfari will record
> > CVs. Mine has not yet arrived, so I am not able to test this...
> >
> > The A-112 is AC coupled, and thus slow changing voltages will not be
> > passed. Check the archives for further details, I myself have asked this
> > very question, as have others I am sure.
> >
> > On thing to try with the A-112 is to create a noise loop with it, apply
> > the output to a sample and hold and use the output from the sample and
> > hold as a CV source. This will yield predictable randomness???
> >
> > Tony
> >
> > James Husted wrote:
> >>
> >> This seems to be the holy grail to modular users lately. All the
> >> interest in the MOTU Volta which turns many DC-couples Audio
> >> interfaces into CV-output devices. Currently the only commercial
> >> products that record continuous CV data (not just note data) are in
> >> the scientific world used for data recording. These are usually very
> >> expensive machines. I would imagine the interest that the Volta has
> >> stirred up would mean that some sort of device would pop up soon on
> >> the market. All it would take is a audio interface that can handle the
> >> voltage swing of a modular and had DC-coupled inputs. It won't be long
> >> I'm sure.
> >> -James
> >>
> >> On Jan 22, 2009, at 1:25 PM, brian wrote:
> >>
> >> > Hello,
> >> >
> >> > I am a very new user to the euro world and have a couple modules so
> >> > far but recently got an A-112 second hand. My time with it has only
> >> > been about 1 hour so far but was wondering if it is possible to
> >> > record CV data as opposed to audio. It seems like I was able to get
> >> > quick swells from a slew-as-envelope but when I slowed the timing
> >> > down it didn't seem to work. I am currently waiting on some proper
> >> > lfo/adsr to fully test it but wanted to see if any of you have any
> >> > info. Likewise, if it is not set-up to do so currently is there a
> >> > possible mod to allow CV recording?
> >> >
> >> > Thanks,
> >> > b.
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > [Non-text portions of this message have been removed]
> >> >
> >> >
> >> >
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >
> >
>
>

I love to use a master keyboard who sends, by data entry, informations (aftertouch, velocity etc) to the a-191 who outputs in a great number o cv outputs.

  When I put an old yamaha midi sequencer between the keyboard and the a-191, I can record those midi events/cvs(usualy in a biiiigggg loop).

   At the end I seat in a chair, a finger in the play button on my old  midi sequencer, and all the modular plays by itself in a big composition of notes effects, dinamics etc.

   I Call this technique: the hidden octopus playing for my pleasure.

    Guilherme

     www.myspace.com/guilhermedaluz

-----Mensagem original-----
De: Doepfer_a100@yahoogroups.com em nome de Tony Rolando
Enviada: qui 22-01-2009 23:13
Para: Doepfer_a100@yahoogroups.com
Assunto: Re: [Doepfer_a100] a-112 - cv recording?
 
Oh yeah, for certain... the original poster mentioned something about 
recording a joystick motion or the like... I was guessing it would be 
good for that task.

Tony

Don Kim wrote:
>
> The tyme sefari's ok for limited CV recording, like gestures, LFOs,
> etc. But I wouldn't say it's a CV recorder, that's just a bonus.
>
> On Thu, Jan 22, 2009 at 2:04 PM, Tony Rolando <tony@makenoisemusic.com 
> <mailto:tony%40makenoisemusic.com>> wrote:
> > Hey Guys, I am pretty sure that the Harvestman Tyme Serfari will record
> > CVs. Mine has not yet arrived, so I am not able to test this...
> >
> > The A-112 is AC coupled, and thus slow changing voltages will not be
> > passed. Check the archives for further details, I myself have asked this
> > very question, as have others I am sure.
> >
> > On thing to try with the A-112 is to create a noise loop with it, apply
> > the output to a sample and hold and use the output from the sample and
> > hold as a CV source. This will yield predictable randomness???
> >
> > Tony
> >
> > James Husted wrote:
> >>
> >> This seems to be the holy grail to modular users lately. All the
> >> interest in the MOTU Volta which turns many DC-couples Audio
> >> interfaces into CV-output devices. Currently the only commercial
> >> products that record continuous CV data (not just note data) are in
> >> the scientific world used for data recording. These are usually very
> >> expensive machines. I would imagine the interest that the Volta has
> >> stirred up would mean that some sort of device would pop up soon on
> >> the market. All it would take is a audio interface that can handle the
> >> voltage swing of a modular and had DC-coupled inputs. It won't be long
> >> I'm sure.
> >> -James
> >>
> >> On Jan 22, 2009, at 1:25 PM, brian wrote:
> >>
> >> > Hello,
> >> >
> >> > I am a very new user to the euro world and have a couple modules so
> >> > far but recently got an A-112 second hand. My time with it has only
> >> > been about 1 hour so far but was wondering if it is possible to
> >> > record CV data as opposed to audio. It seems like I was able to get
> >> > quick swells from a slew-as-envelope but when I slowed the timing
> >> > down it didn't seem to work. I am currently waiting on some proper
> >> > lfo/adsr to fully test it but wanted to see if any of you have any
> >> > info. Likewise, if it is not set-up to do so currently is there a
> >> > possible mod to allow CV recording?
> >> >
> >> > Thanks,
> >> > b.
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > [Non-text portions of this message have been removed]
> >> >
> >> >
> >> >
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >
> >
>
>  




[Non-text portions of this message have been removed]

The A-112 can be modified very easily for DC coupling: short capacitor C11
(100nF, next to the TL064).

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von brian
> Gesendet: Donnerstag, 22. Januar 2009 22:26
> An: Doepfer_a100@yahoogroups.com
> Betreff: Re: [Doepfer_a100] a-112 - cv recording?
>
>
> Hello,
>
> I am a very new user to the euro world and have a couple modules
> so far but recently got an A-112 second hand.  My time with it
> has only been about 1 hour so far but was wondering if it is
> possible to record CV data as opposed to audio.  It seems like I
> was able to get quick swells from a slew-as-envelope but when I
> slowed  the timing down it didn't seem to work.  I am currently
> waiting on some proper lfo/adsr to fully test it but wanted to
> see if any of you have any info.  Likewise, if it is not set-up
> to do so currently is there a possible mod to allow CV recording?
>
> Thanks,
> b.
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

dieter, what are the advantages of ac coupling? i assume that making
modules non dc compatible (mixers, vca's, a112's etc.) has its plus side?

thanks, stu

--- In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:
>
> The A-112 can be modified very easily for DC coupling: short
capacitor C11

> (100nF, next to the TL064).
> 
> Best wishes
> Dieter Doepfer
> 
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> > [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von brian
> > Gesendet: Donnerstag, 22. Januar 2009 22:26
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: Re: [Doepfer_a100] a-112 - cv recording?
> >
> >
> > Hello,
> >
> > I am a very new user to the euro world and have a couple modules
> > so far but recently got an A-112 second hand.  My time with it
> > has only been about 1 hour so far but was wondering if it is
> > possible to record CV data as opposed to audio.  It seems like I
> > was able to get quick swells from a slew-as-envelope but when I
> > slowed  the timing down it didn't seem to work.  I am currently
> > waiting on some proper lfo/adsr to fully test it but wanted to
> > see if any of you have any info.  Likewise, if it is not set-up
> > to do so currently is there a possible mod to allow CV recording?
> >
> > Thanks,
> > b.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>

Hey Dieter, we talked about this before, I just dug up the post, here it 
is below.

"The input of the A-112 is already DC coupled. For DC coupling of the output
one has to short the 100nF capacitor C11. From the schematics I'd expect a
negative DC offset of about -2.5V and an inverted output as the current
output of the DAC is converted into a voltage by an opamp inverter without
input resistor. You will have to add another inverter (e.g. A-175 or A-138c)
to obtain a non-inverted signal and a positive (or with A-138c adjustable)
offset.

Best wishes
Dieter Doepfer"

Sounds as though A-112 + A-138C might be the winning combination for the 
original poster. He probably already has A-138C...

Tony

yahoo@doepfer.de wrote:

>
> The A-112 can be modified very easily for DC coupling: short capacitor C11
> (100nF, next to the TL064).
>
> Best wishes
> Dieter Doepfer
>
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com 
> <mailto:Doepfer_a100%40yahoogroups.com>
> > [mailto:Doepfer_a100@yahoogroups.com 
> <mailto:Doepfer_a100%40yahoogroups.com>]Im Auftrag von brian
> > Gesendet: Donnerstag, 22. Januar 2009 22:26
> > An: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100%40yahoogroups.com>
> > Betreff: Re: [Doepfer_a100] a-112 - cv recording?
> >
> >
> > Hello,
> >
> > I am a very new user to the euro world and have a couple modules
> > so far but recently got an A-112 second hand.  My time with it
> > has only been about 1 hour so far but was wondering if it is
> > possible to record CV data as opposed to audio.  It seems like I
> > was able to get quick swells from a slew-as-envelope but when I
> > slowed  the timing down it didn't seem to work.  I am currently
> > waiting on some proper lfo/adsr to fully test it but wanted to
> > see if any of you have any info.  Likewise, if it is not set-up
> > to do so currently is there a possible mod to allow CV recording?
> >
> > Thanks,
> > b.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>
>

> dieter, what are the advantages of ac coupling? i assume that making
> modules non dc compatible (mixers, vca's, a112's etc.) has its plus side?
>
> thanks, stu

Sometimes there are internal voltage offsets that cannot be avoided or only
with additional efforts (e.g. the famous Moog filter circuit and all
derivates like TB-303 or diode filter, many of the CEM circuits). If ADCs or
DACs are used these are mainly unipolar (i.e. they process only positive
voltages). If an audio signal has to be processed by an ADC it's the easiest
to inject these bipolar signals via capacitors to an internal offset which
is half of the full range (or vice versa pick the audio signal from a DC
biased DAC signal with a capacitor).

Best wishes
Dieter Doepfer

If you are using your modular with midi you could use the a192 module 
to record the cv's to your computer and recall when needed.





--- In Doepfer_a100@yahoogroups.com, brian <koura5578@...> wrote:
>
> Hello,
> 
> I am a very new user to the euro world and have a couple modules so 
far but recently got an A-112 second hand.  My time with it has only 
been about 1 hour so far but was wondering if it is possible to 
record CV data as opposed to audio.  It seems like I was able to get 
quick swells from a slew-as-envelope but when I slowed  the timing 
down it didn't seem to work.  I am currently waiting on some proper 
lfo/adsr to fully test it but wanted to see if any of you have any 
info.  Likewise, if it is not set-up to do so currently is there a 
possible mod to allow CV recording?

> 
> Thanks,
> b.
>  
> 	 
> 	
> 	
> 
> 
> 
> 
> 
> 
> 
> 
> 	
> 
> 
> 	
> 	
> 
> [Non-text portions of this message have been removed]
>

I wish the A-192 were that easy to use.  I have one, I only use it
with Max/MSP since i have a "sensor" reading patch.  The A-192 only
accepts positive signals, and anything faster than MIDI, or even very
close to midi speed will not be as good as recording a CV on the
modular side, and if you want gates or pitch, gotta do it in Max (no
workaround other than blowing an assload of cash on the ASys CV to
midi converter module).  Maybe someone will make something like motu's
new product for reading CVs into aux automation tracks, the proposed
modular OSC device could help things...  :)

On Mon, Jan 26, 2009 at 9:24 AM, jmaddocks1975
<jmaddocks1975@yahoo.co.uk> wrote:

> If you are using your modular with midi you could use the a192 module
> to record the cv's to your computer and recall when needed.
>
> --- In Doepfer_a100@yahoogroups.com, brian <koura5578@...> wrote:
>>
>> Hello,
>>
>> I am a very new user to the euro world and have a couple modules so
> far but recently got an A-112 second hand.  My time with it has only
> been about 1 hour so far but was wondering if it is possible to
> record CV data as opposed to audio.  It seems like I was able to get
> quick swells from a slew-as-envelope but when I slowed  the timing
> down it didn't seem to work.  I am currently waiting on some proper
> lfo/adsr to fully test it but wanted to see if any of you have any
> info.  Likewise, if it is not set-up to do so currently is there a
> possible mod to allow CV recording?
>>
>> Thanks,
>> b.
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> [Non-text portions of this message have been removed]
>>
>
>

Hello Don,
The proposed OSC device is not necessery. Something like that already
exists!
Check out what the people at Sonology developed, they sell this as a kit.
http://www.koncon.nl/ipsonlab/ipscomp_htm/ipsoncomp_specs.htm

Get in touch with them! http://www.koncon.nl/ipsonlab/buy.htm

Greetings,

Ernst





On Mon, Jan 26, 2009 at 11:37 PM, Don Kim <dkimcg@gmail.com> wrote:

>   I wish the A-192 were that easy to use. I have one, I only use it
> with Max/MSP since i have a "sensor" reading patch. The A-192 only
> accepts positive signals, and anything faster than MIDI, or even very
> close to midi speed will not be as good as recording a CV on the
> modular side, and if you want gates or pitch, gotta do it in Max (no
> workaround other than blowing an assload of cash on the ASys CV to
> midi converter module). Maybe someone will make something like motu's
> new product for reading CVs into aux automation tracks, the proposed
> modular OSC device could help things... :)
>
>
> On Mon, Jan 26, 2009 at 9:24 AM, jmaddocks1975
> <jmaddocks1975@yahoo.co.uk <jmaddocks1975%40yahoo.co.uk>> wrote:
> > If you are using your modular with midi you could use the a192 module
> > to record the cv's to your computer and recall when needed.
> >
> > --- In Doepfer_a100@yahoogroups.com <Doepfer_a100%40yahoogroups.com>,
> brian <koura5578@...> wrote:
> >>
> >> Hello,
> >>
> >> I am a very new user to the euro world and have a couple modules so
> > far but recently got an A-112 second hand. My time with it has only
> > been about 1 hour so far but was wondering if it is possible to
> > record CV data as opposed to audio. It seems like I was able to get
> > quick swells from a slew-as-envelope but when I slowed the timing
> > down it didn't seem to work. I am currently waiting on some proper
> > lfo/adsr to fully test it but wanted to see if any of you have any
> > info. Likewise, if it is not set-up to do so currently is there a
> > possible mod to allow CV recording?
> >>
> >> Thanks,
> >> b.
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >
> >
>
>  
>


[Non-text portions of this message have been removed]

No, not really,
0V to +5V is not adequate for CV, and a sample rate of 1KHz is far  
from sufficient.

_g


On 27 Jan 2009, at 00:03, achtung_999 wrote:

> Hello Don,
> The proposed OSC device is not necessery. Something like that already
> exists!
> Check out what the people at Sonology developed, they sell this as a  
> kit.
> http://www.koncon.nl/ipsonlab/ipscomp_htm/ipsoncomp_specs.htm
>
> Get in touch with them! http://www.koncon.nl/ipsonlab/buy.htm
>
> Greetings,
>
> Ernst
>
> On Mon, Jan 26, 2009 at 11:37 PM, Don Kim <dkimcg@gmail.com> wrote:
>
> > I wish the A-192 were that easy to use. I have one, I only use it
> > with Max/MSP since i have a "sensor" reading patch. The A-192 only
> > accepts positive signals, and anything faster than MIDI, or even  
> very
> > close to midi speed will not be as good as recording a CV on the
> > modular side, and if you want gates or pitch, gotta do it in Max (no
> > workaround other than blowing an assload of cash on the ASys CV to
> > midi converter module). Maybe someone will make something like  
> motu's
> > new product for reading CVs into aux automation tracks, the proposed
> > modular OSC device could help things... :)
> >
> >
> > On Mon, Jan 26, 2009 at 9:24 AM, jmaddocks1975
> > <jmaddocks1975@yahoo.co.uk <jmaddocks1975%40yahoo.co.uk>> wrote:
> > > If you are using your modular with midi you could use the a192  
> module
> > > to record the cv's to your computer and recall when needed.
> > >
> > > --- In Doepfer_a100@yahoogroups.com  
> <Doepfer_a100%40yahoogroups.com>,
> > brian <koura5578@...> wrote:
> > >>
> > >> Hello,
> > >>
> > >> I am a very new user to the euro world and have a couple  
> modules so
> > > far but recently got an A-112 second hand. My time with it has  
> only
> > > been about 1 hour so far but was wondering if it is possible to
> > > record CV data as opposed to audio. It seems like I was able to  
> get
> > > quick swells from a slew-as-envelope but when I slowed the timing
> > > down it didn't seem to work. I am currently waiting on some proper
> > > lfo/adsr to fully test it but wanted to see if any of you have any
> > > info. Likewise, if it is not set-up to do so currently is there a
> > > possible mod to allow CV recording?
> > >>
> > >> Thanks,
> > >> b.
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> [Non-text portions of this message have been removed]
> > >>
> > >
> > >
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
> 



[Non-text portions of this message have been removed]

Yes, there were some more issues.. I was a bit quick sorry about that.But
about the 0-5v: come on people.. haven't you heard about shifting the CV
upwards??



On Tue, Jan 27, 2009 at 12:09 AM, Guy Drieghe D. <guy@guyd2.com> wrote:

>
> No, not really,
> 0V to +5V is not adequate for CV, and a sample rate of 1KHz is far
> from sufficient.
>
> _g
>
>
> On 27 Jan 2009, at 00:03, achtung_999 wrote:
>
> > Hello Don,
> > The proposed OSC device is not necessery. Something like that already
> > exists!
> > Check out what the people at Sonology developed, they sell this as a
> > kit.
> > http://www.koncon.nl/ipsonlab/ipscomp_htm/ipsoncomp_specs.htm
> >
> > Get in touch with them! http://www.koncon.nl/ipsonlab/buy.htm
> >
> > Greetings,
> >
> > Ernst
> >
> > On Mon, Jan 26, 2009 at 11:37 PM, Don Kim <dkimcg@gmail.com<dkimcg%40gmail.com>>
> wrote:
> >
> > > I wish the A-192 were that easy to use. I have one, I only use it
> > > with Max/MSP since i have a "sensor" reading patch. The A-192 only
> > > accepts positive signals, and anything faster than MIDI, or even
> > very
> > > close to midi speed will not be as good as recording a CV on the
> > > modular side, and if you want gates or pitch, gotta do it in Max (no
> > > workaround other than blowing an assload of cash on the ASys CV to
> > > midi converter module). Maybe someone will make something like
> > motu's
> > > new product for reading CVs into aux automation tracks, the proposed
> > > modular OSC device could help things... :)
> > >
> > >
> > > On Mon, Jan 26, 2009 at 9:24 AM, jmaddocks1975
> > > <jmaddocks1975@yahoo.co.uk <jmaddocks1975%40yahoo.co.uk><jmaddocks1975%
> 40yahoo.co.uk>> wrote:
> > > > If you are using your modular with midi you could use the a192
> > module
> > > > to record the cv's to your computer and recall when needed.
> > > >
> > > > --- In Doepfer_a100@yahoogroups.com <Doepfer_a100%40yahoogroups.com>
> > <Doepfer_a100%40yahoogroups.com>,
> > > brian <koura5578@...> wrote:
> > > >>
> > > >> Hello,
> > > >>
> > > >> I am a very new user to the euro world and have a couple
> > modules so
> > > > far but recently got an A-112 second hand. My time with it has
> > only
> > > > been about 1 hour so far but was wondering if it is possible to
> > > > record CV data as opposed to audio. It seems like I was able to
> > get
> > > > quick swells from a slew-as-envelope but when I slowed the timing
> > > > down it didn't seem to work. I am currently waiting on some proper
> > > > lfo/adsr to fully test it but wanted to see if any of you have any
> > > > info. Likewise, if it is not set-up to do so currently is there a
> > > > possible mod to allow CV recording?
> > > >>
> > > >> Thanks,
> > > >> b.
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >>
> > > >> [Non-text portions of this message have been removed]
> > > >>
> > > >
> > > >
> > >
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
> >
>
> [Non-text portions of this message have been removed]
>
>  
>


[Non-text portions of this message have been removed]

You'll need at least -5V to +5V for proper CV handling in a modular;  
probably even more. It's especially the through-zero portion that is  
important...

But the 1KHz sampling rate is the instant killer in this case.
Volta works at up-to 192KHz, and that's more like it.

_g

On 27 Jan 2009, at 00:13, achtung_999 wrote:

> Yes, there were some more issues.. I was a bit quick sorry about  
> that.But
> about the 0-5v: come on people.. haven't you heard about shifting  
> the CV
> upwards??
>
> On Tue, Jan 27, 2009 at 12:09 AM, Guy Drieghe D. <guy@guyd2.com>  
> wrote:
>
> >
> > No, not really,
> > 0V to +5V is not adequate for CV, and a sample rate of 1KHz is far
> > from sufficient.
> >
> > _g
> >
> >
> > On 27 Jan 2009, at 00:03, achtung_999 wrote:
> >
> > > Hello Don,
> > > The proposed OSC device is not necessery. Something like that  
> already
> > > exists!
> > > Check out what the people at Sonology developed, they sell this  
> as a
> > > kit.
> > > http://www.koncon.nl/ipsonlab/ipscomp_htm/ipsoncomp_specs.htm
> > >
> > > Get in touch with them! http://www.koncon.nl/ipsonlab/buy.htm
> > >
> > > Greetings,
> > >
> > > Ernst
> > >
> > > On Mon, Jan 26, 2009 at 11:37 PM, Don Kim  
> <dkimcg@gmail.com<dkimcg%40gmail.com>>
> > wrote:
> > >
> > > > I wish the A-192 were that easy to use. I have one, I only use  
> it
> > > > with Max/MSP since i have a "sensor" reading patch. The A-192  
> only
> > > > accepts positive signals, and anything faster than MIDI, or even
> > > very
> > > > close to midi speed will not be as good as recording a CV on the
> > > > modular side, and if you want gates or pitch, gotta do it in  
> Max (no
> > > > workaround other than blowing an assload of cash on the ASys  
> CV to
> > > > midi converter module). Maybe someone will make something like
> > > motu's
> > > > new product for reading CVs into aux automation tracks, the  
> proposed
> > > > modular OSC device could help things... :)
> > > >
> > > >
> > > > On Mon, Jan 26, 2009 at 9:24 AM, jmaddocks1975
> > > > <jmaddocks1975@yahoo.co.uk  
> <jmaddocks1975%40yahoo.co.uk><jmaddocks1975%
> > 40yahoo.co.uk>> wrote:
> > > > > If you are using your modular with midi you could use the a192
> > > module
> > > > > to record the cv's to your computer and recall when needed.
> > > > >
> > > > > --- In Doepfer_a100@yahoogroups.com  
> <Doepfer_a100%40yahoogroups.com>
> > > <Doepfer_a100%40yahoogroups.com>,
> > > > brian <koura5578@...> wrote:
> > > > >>
> > > > >> Hello,
> > > > >>
> > > > >> I am a very new user to the euro world and have a couple
> > > modules so
> > > > > far but recently got an A-112 second hand. My time with it has
> > > only
> > > > > been about 1 hour so far but was wondering if it is possible  
> to
> > > > > record CV data as opposed to audio. It seems like I was able  
> to
> > > get
> > > > > quick swells from a slew-as-envelope but when I slowed the  
> timing
> > > > > down it didn't seem to work. I am currently waiting on some  
> proper
> > > > > lfo/adsr to fully test it but wanted to see if any of you  
> have any
> > > > > info. Likewise, if it is not set-up to do so currently is  
> there a
> > > > > possible mod to allow CV recording?
> > > > >>
> > > > >> Thanks,
> > > > >> b.
> > > > >>
> > > > >>

I agree on the sampling rate. But let's not forget that these boards are
made for bodily controllers.
You would agree that 1 KHZ is enough for tracking human movement?  ;-)

I would say that 22.5 KHZ would already be quite sufficient for tracking CV,
everything above that is luxery.

Can you elaborate why the through zero point is so important? I am curious.
It is probably more likely to be a bitch when designing stuff like this
though. Seeing that most of these machines actually are not able to do this.

Besides this I recently bought a A192 (thanks Guillermo!) and am very happy
with it despite its constraints.
But I knew about these on beforehand.


Ernst





On Tue, Jan 27, 2009 at 12:17 AM, Guy Drieghe D. <guy@guyd2.com> wrote:

>   You'll need at least -5V to +5V for proper CV handling in a modular;
> probably even more. It's especially the through-zero portion that is
> important...
>
> But the 1KHz sampling rate is the instant killer in this case.
> Volta works at up-to 192KHz, and that's more like it.
>
> _g
>
>
> On 27 Jan 2009, at 00:13, achtung_999 wrote:
>
> > Yes, there were some more issues.. I was a bit quick sorry about
> > that.But
> > about the 0-5v: come on people.. haven't you heard about shifting
> > the CV
> > upwards??
> >
> > On Tue, Jan 27, 2009 at 12:09 AM, Guy Drieghe D. <guy@guyd2.com<guy%40guyd2.com>>
>
> > wrote:
> >
> > >
> > > No, not really,
> > > 0V to +5V is not adequate for CV, and a sample rate of 1KHz is far
> > > from sufficient.
> > >
> > > _g
> > >
> > >
> > > On 27 Jan 2009, at 00:03, achtung_999 wrote:
> > >
> > > > Hello Don,
> > > > The proposed OSC device is not necessery. Something like that
> > already
> > > > exists!
> > > > Check out what the people at Sonology developed, they sell this
> > as a
> > > > kit.
> > > > http://www.koncon.nl/ipsonlab/ipscomp_htm/ipsoncomp_specs.htm
> > > >
> > > > Get in touch with them! http://www.koncon.nl/ipsonlab/buy.htm
> > > >
> > > > Greetings,
> > > >
> > > > Ernst
> > > >
> > > > On Mon, Jan 26, 2009 at 11:37 PM, Don Kim
> > <dkimcg@gmail.com <dkimcg%40gmail.com><dkimcg%40gmail.com>>
> > > wrote:
> > > >
> > > > > I wish the A-192 were that easy to use. I have one, I only use
> > it
> > > > > with Max/MSP since i have a "sensor" reading patch. The A-192
> > only
> > > > > accepts positive signals, and anything faster than MIDI, or even
> > > > very
> > > > > close to midi speed will not be as good as recording a CV on the
> > > > > modular side, and if you want gates or pitch, gotta do it in
> > Max (no
> > > > > workaround other than blowing an assload of cash on the ASys
> > CV to
> > > > > midi converter module). Maybe someone will make something like
> > > > motu's
> > > > > new product for reading CVs into aux automation tracks, the
> > proposed
> > > > > modular OSC device could help things... :)
> > > > >
> > > > >
> > > > > On Mon, Jan 26, 2009 at 9:24 AM, jmaddocks1975
> > > > > <jmaddocks1975@yahoo.co.uk <jmaddocks1975%40yahoo.co.uk>
> > <jmaddocks1975%40yahoo.co.uk><jmaddocks1975%
>
> > > 40yahoo.co.uk>> wrote:
> > > > > > If you are using your modular with midi you could use the a192
> > > > module
> > > > > > to record the cv's to your computer and recall when needed.
> > > > > >
> > > > > > --- In Doepfer_a100@yahoogroups.com<Doepfer_a100%40yahoogroups.com>
> > <Doepfer_a100%40yahoogroups.com>
> > > > <Doepfer_a100%40yahoogroups.com>,
> > > > > brian <koura5578@...> wrote:
> > > > > >>
> > > > > >> Hello,
> > > > > >>
> > > > > >> I am a very new user to the euro world and have a couple
> > > > modules so
> > > > > > far but recently got an A-112 second hand. My time with it has
> > > > only
> > > > > > been about 1 hour so far but was wondering if it is possible
> > to
> > > > > > record CV data as opposed to audio. It seems like I was able
> > to
> > > > get
> > > > > > quick swells from a slew-as-envelope but when I slowed the
> > timing
> > > > > > down it didn't seem to work. I am currently waiting on some
> > proper
> > > > > > lfo/adsr to fully test it but wanted to see if any of you
> > have any
> > > > > > info. Likewise, if it is not set-up to do so currently is
> > there a
> > > > > > possible mod to allow CV recording?
> > > > > >>
> > > > > >> Thanks,
> > > > > >> b.
> > > > > >>
> > > > > >>
>
>  
>


[Non-text portions of this message have been removed]

Not for tracking faster movement.  Motion Capture systems run quite a
bit higher than 1Khz.
Besides, I'd rather stop spending time trying to make systems, and
faceplates, and jacks, and dealing with different voltages etc.  I'd
rather cough up an extra $1-200 and have something that was designed
with modular synths in mind and has the range to deal with minutes
from an LFO or ms/Mhz from audio.  Volta comes close, but it's only
one way and who knows how open it will be. The future may be bright,
but for now, Max and a A-192 to get CVs to midi.  Not quite the same
as a CV recorder tho...Here comes the Modcan jeolousy... :D




On Mon, Jan 26, 2009 at 3:34 PM, achtung_999
<heinrich.himmelwasser@gmail.com> wrote:

> I agree on the sampling rate. But let's not forget that these boards are
> made for bodily controllers.
> You would agree that 1 KHZ is enough for tracking human movement? ;-)
>
> I would say that 22.5 KHZ would already be quite sufficient for tracking CV,
> everything above that is luxery.
>
> Can you elaborate why the through zero point is so important? I am curious.
> It is probably more likely to be a bitch when designing stuff like this
> though. Seeing that most of these machines actually are not able to do this.
>
> Besides this I recently bought a A192 (thanks Guillermo!) and am very happy
> with it despite its constraints.
> But I knew about these on beforehand.
>
> Ernst
>
> On Tue, Jan 27, 2009 at 12:17 AM, Guy Drieghe D. <guy@guyd2.com> wrote:
>
>> You'll need at least -5V to +5V for proper CV handling in a modular;
>> probably even more. It's especially the through-zero portion that is
>> important...
>>
>> But the 1KHz sampling rate is the instant killer in this case.
>> Volta works at up-to 192KHz, and that's more like it.
>>
>> _g
>>
>>
>> On 27 Jan 2009, at 00:13, achtung_999 wrote:
>>
>> > Yes, there were some more issues.. I was a bit quick sorry about
>> > that.But
>> > about the 0-5v: come on people.. haven't you heard about shifting
>> > the CV
>> > upwards??
>> >
>> > On Tue, Jan 27, 2009 at 12:09 AM, Guy Drieghe D.
>> > <guy@guyd2.com<guy%40guyd2.com>>
>>
>> > wrote:
>> >
>> > >
>> > > No, not really,
>> > > 0V to +5V is not adequate for CV, and a sample rate of 1KHz is far
>> > > from sufficient.
>> > >
>> > > _g
>> > >
>> > >
>> > > On 27 Jan 2009, at 00:03, achtung_999 wrote:
>> > >
>> > > > Hello Don,
>> > > > The proposed OSC device is not necessery. Something like that
>> > already
>> > > > exists!
>> > > > Check out what the people at Sonology developed, they sell this
>> > as a
>> > > > kit.
>> > > > http://www.koncon.nl/ipsonlab/ipscomp_htm/ipsoncomp_specs.htm
>> > > >
>> > > > Get in touch with them! http://www.koncon.nl/ipsonlab/buy.htm
>> > > >
>> > > > Greetings,
>> > > >
>> > > > Ernst
>> > > >
>> > > > On Mon, Jan 26, 2009 at 11:37 PM, Don Kim
>> > <dkimcg@gmail.com <dkimcg%40gmail.com><dkimcg%40gmail.com>>
>> > > wrote:
>> > > >
>> > > > > I wish the A-192 were that easy to use. I have one, I only use
>> > it
>> > > > > with Max/MSP since i have a "sensor" reading patch. The A-192
>> > only
>> > > > > accepts positive signals, and anything faster than MIDI, or even
>> > > > very
>> > > > > close to midi speed will not be as good as recording a CV on the
>> > > > > modular side, and if you want gates or pitch, gotta do it in
>> > Max (no
>> > > > > workaround other than blowing an assload of cash on the ASys
>> > CV to
>> > > > > midi converter module). Maybe someone will make something like
>> > > > motu's
>> > > > > new product for reading CVs into aux automation tracks, the
>> > proposed
>> > > > > modular OSC device could help things... :)
>> > > > >
>> > > > >
>> > > > > On Mon, Jan 26, 2009 at 9:24 AM, jmaddocks1975
>> > > > > <jmaddocks1975@yahoo.co.uk <jmaddocks1975%40yahoo.co.uk>
>> > <jmaddocks1975%40yahoo.co.uk><jmaddocks1975%
>>
>> > > 40yahoo.co.uk>> wrote:
>> > > > > > If you are using your modular with midi you could use the a192
>> > > > module
>> > > > > > to record the cv's to your computer and recall when needed.
>> > > > > >
>> > > > > > --- In
>> > > > > > Doepfer_a100@yahoogroups.com<Doepfer_a100%40yahoogroups.com>
>> > <Doepfer_a100%40yahoogroups.com>
>> > > > <Doepfer_a100%40yahoogroups.com>,
>> > > > > brian <koura5578@...> wrote:
>> > > > > >>
>> > > > > >> Hello,
>> > > > > >>
>> > > > > >> I am a very new user to the euro world and have a couple
>> > > > modules so
>> > > > > > far but recently got an A-112 second hand. My time with it has
>> > > > only
>> > > > > > been about 1 hour so far but was wondering if it is possible
>> > to
>> > > > > > record CV data as opposed to audio. It seems like I was able
>> > to
>> > > > get
>> > > > > > quick swells from a slew-as-envelope but when I slowed the
>> > timing
>> > > > > > down it didn't seem to work. I am currently waiting on some
>> > proper
>> > > > > > lfo/adsr to fully test it but wanted to see if any of you
>> > have any
>> > > > > > info. Likewise, if it is not set-up to do so currently is
>> > there a
>> > > > > > possible mod to allow CV recording?
>> > > > > >>
>> > > > > >> Thanks,
>> > > > > >> b.
>> > > > > >>
>> > > > > >>
>>
>>
>>
>
> [Non-text portions of this message have been removed]
>
>

On 27 Jan 2009, at 00:34, achtung_999 wrote:

> I agree on the sampling rate. But let's not forget that these boards  
> are
> made for bodily controllers.
>
Yes, I saw that, and was actually wondering what these then had to do  
with CV writing (and reading), as mentioned in the post you replied  
to. There are several devices like this one on the market, and they do  
serve a particular niche, yes.

> You would agree that 1 KHZ is enough for tracking human movement? ;-)
>
Not in the morning, when I just had my espresso's ;-)

> I would say that 22.5 KHZ would already be quite sufficient for  
> tracking CV,
> everything above that is luxery.
>
Oh no, certainly not. I'd say 44KHz or thereabouts is the absolute  
minimum... I leave the math explanation to the math-oriented people in  
here. My coffee has already worn out...

> Can you elaborate why the through zero point is so important? I am  
> curious.
>
Most CV voltages in a modular are bipolar, with envelopes and keyboard  
the most noteable exceptions. LFO's, S/H and what not all go through  
zero. Or more correctly: *can* go through zero.


> It is probably more likely to be a bitch when designing stuff like  
> this
> though. Seeing that most of these machines actually are not able to  
> do this.
>
You're correct here. It seems to be difficult, since nothing really is  
on the market yet, and we had about 30 years to develop such a beast.  
Probably more a question of market demand than a technical one, but  
still...


_g

> Besides this I recently bought a A192 (thanks Guillermo!) and am  
> very happy
> with it despite its constraints.
> But I knew about these on beforehand.
>
> Ernst
>
> On Tue, Jan 27, 2009 at 12:17 AM, Guy Drieghe D. <guy@guyd2.com>  
> wrote:
>
> > You'll need at least -5V to +5V for proper CV handling in a modular;
> > probably even more. It's especially the through-zero portion that is
> > important...
> >
> > But the 1KHz sampling rate is the instant killer in this case.
> > Volta works at up-to 192KHz, and that's more like it.
> >
> > _g
> >
> >
> > On 27 Jan 2009, at 00:13, achtung_999 wrote:
> >
> > > Yes, there were some more issues.. I was a bit quick sorry about
> > > that.But
> > > about the 0-5v: come on people.. haven't you heard about shifting
> > > the CV
> > > upwards??
> > >
> > > On Tue, Jan 27, 2009 at 12:09 AM, Guy Drieghe D.  
> <guy@guyd2.com<guy%40guyd2.com>>
> >
> > > wrote:
> > >
> > > >
> > > > No, not really,
> > > > 0V to +5V is not adequate for CV, and a sample rate of 1KHz is  
> far
> > > > from sufficient.
> > > >
> > > > _g
> > > >
> > > >
> > > > On 27 Jan 2009, at 00:03, achtung_999 wrote:
> > > >
> > > > > Hello Don,
> > > > > The proposed OSC device is not necessery. Something like that
> > > already
> > > > > exists!
> > > > > Check out what the people at Sonology developed, they sell  
> this
> > > as a
> > > > > kit.
> > > > > http://www.koncon.nl/ipsonlab/ipscomp_htm/ipsoncomp_specs.htm
> > > > >
> > > > > Get in touch with them! http://www.koncon.nl/ipsonlab/buy.htm
> > > > >
> > > > > Greetings,
> > > > >
> > > > > Ernst
> > > > >
> > > > > On Mon, Jan 26, 2009 at 11:37 PM, Don Kim
> > > <dkimcg@gmail.com <dkimcg%40gmail.com><dkimcg%40gmail.com>>
> > > > wrote:
> > > > >
> > > > > > I wish the A-192 were that easy to use. I have one, I only  
> use
> > > it
> > > > > > with Max/MSP since i have a "sensor" reading patch. The  
> A-192
> > > only
> > > > > > accepts positive signals, and anything faster than MIDI,  
> or even
> > > > > very
> > > > > > close to midi speed will not be as good as recording a CV  
> on the
> > > > > > modular side, and if you want gates or pitch, gotta do it in
> > > Max (no
> > > > > > workaround other than blowing an assload of cash on the ASys
> > > CV to
> > > > > > midi converter module). Maybe someone will make something  
> like
> > > > > motu's
> > > > > > new product for reading CVs into aux automation tracks, the
> > > proposed
> > > > > > modular OSC device could help things... :)
> > > > > >
> > > > > >
> > > > > > On Mon, Jan 26, 2009 at 9:24 AM, jmaddocks1975
> > > > > > <jmaddocks1975@yahoo.co.uk <jmaddocks1975%40yahoo.co.uk>
> > > <jmaddocks1975%40yahoo.co.uk><jmaddocks1975%
> >
> > > > 40yahoo.co.uk>> wrote:
> > > > > > > If you are using your modular with midi you could use  
> the a192
> > > > > module
> > > > > > > to record the cv's to your computer and recall when  
> needed.
> > > > > > >
> > > > > > > --- In  
> Doepfer_a100@yahoogroups.com<Doepfer_a100%40yahoogroups.com>
> > > <Doepfer_a100%40yahoogroups.com>
> > > > > <Doepfer_a100%40yahoogroups.com>,
> > > > > > brian <koura5578@...> wrote:
> > > > > > >>
> > > > > > >> Hello,
> > > > > > >>
> > > > > > >> I am a very new user to the euro world and have a couple
> > > > > modules so
> > > > > > > far but recently got an A-112 second hand. My time with  
> it has
> > > > > only
> > > > > > > been about 1 hour so far but was wondering if it is  
> possible
> > > to
> > > > > > > record CV data as opposed to audio. It seems like I was  
> able
> > > to
> > > > > get
> > > > > > > quick swells from a slew-as-envelope but when I slowed the
> > > timing
> > > > > > > down it didn't seem to work. I am currently waiting on  
> some
> > > proper
> > > > > > > lfo/adsr to fully test it but wanted to see if any of you
> > > have any
> > > > > > > info. Likewise, if it is not set-up to do so currently is
> > > there a
> > > > > > > possible mod to allow CV recording?
> > > > > > >>
> > > > > > >> Thanks,
> > > > > > >> b.
> > > > > > >>
> > > > > > >>
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
> 
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>
>
> > I agree on the sampling rate. But let's not forget that these boards
> > are
> > made for bodily controllers.
> >
> Yes, I saw that, and was actually wondering what these then had to do
> with CV writing (and reading), as mentioned in the post you replied
> to. There are several devices like this one on the market, and they do
> serve a particular niche, yes.


That was indeed what I saw later. I know the designer and he was having some
experimental set up when I spoke to him last week.. This set up implied use
in modulars and such. I wonder if he buffed up the frequency for that..
But I was just a bit too quick to post this stuff here..



> > You would agree that 1 KHZ is enough for tracking human movement? ;-)
> >
> Not in the morning, when I just had my espresso's ;-)


LOL!


> I would say that 22.5 KHZ would already be quite sufficient for
> > tracking CV,
> > everything above that is luxery.
> >
> Oh no, certainly not. I'd say 44KHz or thereabouts is the absolute
> minimum... I leave the math explanation to the math-oriented people in
> here. My coffee has already worn out...


You might be right on that one. And let's leave the math out for now... ;-)



> > Can you elaborate why the through zero point is so important? I am
> > curious.
> >
> Most CV voltages in a modular are bipolar, with envelopes and keyboard
> the most noteable exceptions. LFO's, S/H and what not all go through
> zero. Or more correctly: *can* go through zero.


Yes I know that. And that still does not answer my question really..
Let's say we have an pseudo-ideal CV> digital converter. It would work from
0 volts to anything, so no upper limit. (Just assume this..)
I would shift the CV up by the amount it needs to have the most extreme
negative amplitude point to be 0 volts.
Let's assume this is 5 volts. My device now tracks it nicely and records it
in whichever imaginative software format we might think of.
I now would like to use this signal to drive my modular.
I would take the output from the software via my reverse device and shift
the resulting voltages down 5 volts..

In my opinion this would not be different than the original signal. would
it?
Sorry if I was unclear about this.
And yes, I know it's a hassle ;-)


[Non-text portions of this message have been removed]

I don't think it would be very hard to modify a typical Audio A/D  
converter design to do the job needed here. Remove the AC coupling,  
change the input scale to handle +/-5 Volts and keep it sampling at  
96k and 24bits. My math has never been my strong suit but I imagine  
24bits should cover a 10volt swing pretty easily with the resolution  
needed, and 96kHz should be fine enough timing wise. This could almost  
be done with an adaptor that precision scaled the analog +/-5V down to  
a range that a typical computer A/D could handle (and of course do the  
opposite for the output) and you could then use any interface that  
wasn't AC coupled (hard to find apparently). In any case I can't see  
it being that hard for a company to make a A/D converter that can  
sample modular CV ranges at the speed that typical audio interfaces do  
now and shoot the info to a DAW in a format it could understand.  Like  
I've said before on this list - if the Volta take off you will see a  
hardware solution very soon after. It is not like they have to invent  
something from the ground floor.
-James


On Jan 26, 2009, at 4:17 PM, achtung_999 wrote:
>
> > I would say that 22.5 KHZ would already be quite sufficient for
> > > tracking CV,
> > > everything above that is luxery.
> > >
> > Oh no, certainly not. I'd say 44KHz or thereabouts is the absolute
> > minimum... I leave the math explanation to the math-oriented  
> people in
> > here. My coffee has already worn out...
>
>
> Yes I know that. And that still does not answer my question really..
> Let's say we have an pseudo-ideal CV> digital converter. It would  
> work from
> 0 volts to anything, so no upper limit. (Just assume this..)
> I would shift the CV up by the amount it needs to have the most  
> extreme
> negative amplitude point to be 0 volts.
> Let's assume this is 5 volts. My device now tracks it nicely and  
> records it
> in whichever imaginative software format we might think of.
> I now would like to use this signal to drive my modular.
> I would take the output from the software via my reverse device and  
> shift
> the resulting voltages down 5 volts..
>
> In my opinion this would not be different than the original signal.  
> would
> it?
> Sorry if I was unclear about this.
> And yes, I know it's a hassle ;-)
>



[Non-text portions of this message have been removed]

On 27 Jan 2009, at 01:17, achtung_999 wrote:


//skipperdy skip//

> > Most CV voltages in a modular are bipolar, with envelopes and  
> keyboard
> > the most noteable exceptions. LFO's, S/H and what not all go through
> > zero. Or more correctly: *can* go through zero.
>
> Yes I know that. And that still does not answer my question really..
> Let's say we have an pseudo-ideal CV> digital converter. It would  
> work from
> 0 volts to anything, so no upper limit. (Just assume this..)
> I would shift the CV up by the amount it needs to have the most  
> extreme
> negative amplitude point to be 0 volts.
> Let's assume this is 5 volts. My device now tracks it nicely and  
> records it
> in whichever imaginative software format we might think of.
> I now would like to use this signal to drive my modular.
> I would take the output from the software via my reverse device and  
> shift
> the resulting voltages down 5 volts..
>
> In my opinion this would not be different than the original signal.  
> would
> it?
>

In some way you are right, yes.

There are certain CV's which don't yield the same result when "pulled  
down" with a negative bias (like, say, a negative halfwave rectifier),  
but that's not where your theory goes a bit wrong... It's in your  
assumption that there's no upper [voltage] limit [as a way of  
reasoning this through], and that the maximum required voltage is only  
5 volts. Most, but not all, analog modular systems require +10V to use  
their full range (pitch is a good example). This would mean that your  
device should be able to output +20V to pull that voltage down to the  
required maximum range of +10V (and an additional -10V to have  
bipolarity). Now, what is going to happen when you don't need  
bipolarity ? You are going to send a signal ranging from zero to +20  
volts to the CV inputs of your system ? I'd rather not do that.

Furthermore, most modulars are hardwired [by technology] to accept a  
given [bipolar] range, and a big part of the circuits and control pots  
are matched to work with this. By using a "wrong" voltage to start  
with, and then fiddling with it to make it match, I reckon you're  
gonna end up with a big mess pretty soon.

It's pretty clear, I think, that a device like this should at least  
start off with the correct range and properly engineered hardware to  
make it useable and worth something.


> Sorry if I was unclear about this.
> And yes, I know it's a hassle ;-)
>

Not a hassle. Just a fascinating subject. :-)


_g

Exactly what I have been saying before, James.

According to a bunch of engineers and DSP programmers I spoke to over  
the last couple of years, it is not hard at all to develop such a  
device. Sampling rate and resolution are not the big issue anymore,  
although hi-end AD/DA's are still exponentially more expensive than  
their 8- or 16bit counterparts. 96k/24b is what I heard most as a  
feasible figure, but higher would still be better. And this is exactly  
what Volta solved so brilliantly (in all its simplicity): just use  
your DAW's sampling rate. If your system can pull 192kHz @ 24b...  
perfect; but you'd still do fine with a more regular setting of 44/24...

What most of the tech guys I spoke with saw as a bigger challenge  
(read: problem), is the software. The GUI and such... And again, I  
feel that Volta approached this quite well. Simple, but effective, and  
apparently also rather flexible (did anyone see its amazing quadrature  
LFO yet? -- http://motu-volta.blogspot.com/ )

As you already said, James, other hardware is going to follow soon,  
most likely as a more dedicated device instead of "just" a DC-capable  
audio interface. And I reckon the accompanying software is going to  
follow soon too, once people are getting used to this new paradigm in  
modular control, and will provide feedback and propose enhancements to  
the manufacturers.

Well, at least I hope so.
I also kinda hope Dieter is having sleepless nights over this ;-)


_g

On 27 Jan 2009, at 02:36, James Husted wrote:
> I don't think it would be very hard to modify a typical Audio A/D
> converter design to do the job needed here. Remove the AC coupling,
> change the input scale to handle +/-5 Volts and keep it sampling at
> 96k and 24bits. My math has never been my strong suit but I imagine
> 24bits should cover a 10volt swing pretty easily with the resolution
> needed, and 96kHz should be fine enough timing wise. This could almost
> be done with an adaptor that precision scaled the analog +/-5V down to
> a range that a typical computer A/D could handle (and of course do the
> opposite for the output) and you could then use any interface that
> wasn't AC coupled (hard to find apparently). In any case I can't see
> it being that hard for a company to make a A/D converter that can
> sample modular CV ranges at the speed that typical audio interfaces do
> now and shoot the info to a DAW in a format it could understand. Like
> I've said before on this list - if the Volta take off you will see a
> hardware solution very soon after. It is not like they have to invent
> something from the ground floor.
> -James
>
> On Jan 26, 2009, at 4:17 PM, achtung_999 wrote:
> >
> > > I would say that 22.5 KHZ would already be quite sufficient for
> > > > tracking CV,
> > > > everything above that is luxery.
> > > >
> > > Oh no, certainly not. I'd say 44KHz or thereabouts is the absolute
> > > minimum... I leave the math explanation to the math-oriented
> > people in
> > > here. My coffee has already worn out...
> >
> >
> > Yes I know that. And that still does not answer my question really..
> > Let's say we have an pseudo-ideal CV> digital converter. It would
> > work from
> > 0 volts to anything, so no upper limit. (Just assume this..)
> > I would shift the CV up by the amount it needs to have the most
> > extreme
> > negative amplitude point to be 0 volts.
> > Let's assume this is 5 volts. My device now tracks it nicely and
> > records it
> > in whichever imaginative software format we might think of.
> > I now would like to use this signal to drive my modular.
> > I would take the output from the software via my reverse device and
> > shift
> > the resulting voltages down 5 volts..
> >
> > In my opinion this would not be different than the original signal.
> > would
> > it?
> > Sorry if I was unclear about this.
> > And yes, I know it's a hassle ;-)
> >
>

I wonder how the ASys rs290 sampler would do with this task.  It has a very
high sample rate.  There's nothing in the description about recording CV's
though.

On Mon, Jan 26, 2009 at 6:40 PM, Guy Drieghe D. <guy@guyd2.com> wrote:

>
> Exactly what I have been saying before, James.
>
> According to a bunch of engineers and DSP programmers I spoke to over
> the last couple of years, it is not hard at all to develop such a
> device. Sampling rate and resolution are not the big issue anymore,
> although hi-end AD/DA's are still exponentially more expensive than
> their 8- or 16bit counterparts. 96k/24b is what I heard most as a
> feasible figure, but higher would still be better. And this is exactly
> what Volta solved so brilliantly (in all its simplicity): just use
> your DAW's sampling rate. If your system can pull 192kHz @ 24b...
> perfect; but you'd still do fine with a more regular setting of 44/24...
>
> What most of the tech guys I spoke with saw as a bigger challenge
> (read: problem), is the software. The GUI and such... And again, I
> feel that Volta approached this quite well. Simple, but effective, and
> apparently also rather flexible (did anyone see its amazing quadrature
> LFO yet? -- http://motu-volta.blogspot.com/ )
>
> As you already said, James, other hardware is going to follow soon,
> most likely as a more dedicated device instead of "just" a DC-capable
> audio interface. And I reckon the accompanying software is going to
> follow soon too, once people are getting used to this new paradigm in
> modular control, and will provide feedback and propose enhancements to
> the manufacturers.
>
> Well, at least I hope so.
> I also kinda hope Dieter is having sleepless nights over this ;-)
>
> _g
>
>
> On 27 Jan 2009, at 02:36, James Husted wrote:
> > I don't think it would be very hard to modify a typical Audio A/D
> > converter design to do the job needed here. Remove the AC coupling,
> > change the input scale to handle +/-5 Volts and keep it sampling at
> > 96k and 24bits. My math has never been my strong suit but I imagine
> > 24bits should cover a 10volt swing pretty easily with the resolution
> > needed, and 96kHz should be fine enough timing wise. This could almost
> > be done with an adaptor that precision scaled the analog +/-5V down to
> > a range that a typical computer A/D could handle (and of course do the
> > opposite for the output) and you could then use any interface that
> > wasn't AC coupled (hard to find apparently). In any case I can't see
> > it being that hard for a company to make a A/D converter that can
> > sample modular CV ranges at the speed that typical audio interfaces do
> > now and shoot the info to a DAW in a format it could understand. Like
> > I've said before on this list - if the Volta take off you will see a
> > hardware solution very soon after. It is not like they have to invent
> > something from the ground floor.
> > -James
> >
> > On Jan 26, 2009, at 4:17 PM, achtung_999 wrote:
> > >
> > > > I would say that 22.5 KHZ would already be quite sufficient for
> > > > > tracking CV,
> > > > > everything above that is luxery.
> > > > >
> > > > Oh no, certainly not. I'd say 44KHz or thereabouts is the absolute
> > > > minimum... I leave the math explanation to the math-oriented
> > > people in
> > > > here. My coffee has already worn out...
> > >
> > >
> > > Yes I know that. And that still does not answer my question really..
> > > Let's say we have an pseudo-ideal CV> digital converter. It would
> > > work from
> > > 0 volts to anything, so no upper limit. (Just assume this..)
> > > I would shift the CV up by the amount it needs to have the most
> > > extreme
> > > negative amplitude point to be 0 volts.
> > > Let's assume this is 5 volts. My device now tracks it nicely and
> > > records it
> > > in whichever imaginative software format we might think of.
> > > I now would like to use this signal to drive my modular.
> > > I would take the output from the software via my reverse device and
> > > shift
> > > the resulting voltages down 5 volts..
> > >
> > > In my opinion this would not be different than the original signal.
> > > would
> > > it?
> > > Sorry if I was unclear about this.
> > > And yes, I know it's a hassle ;-)
> > >
> >
>
>  
>


[Non-text portions of this message have been removed]

Dear members,

the 9U versions of the A-100 suitcase and the low cost case are now
available. It depends upon the pre-orders of the corresponding Doepfer
representative when the cases will be available in your country.

Even the low cost Midi-to-CV/Gate interface A-190-2 is now shipping.

Best wishes
Dieter Doepfer

all this talk of midi conversion and computers is all very well ;) but
the beauty of a module that records cv is that it's a MODULE that
records cv. and when i pack my little kit together and trundle off to
some funny noises gig, my cv recorder is there with me (i'd rather
take a banjo to a gig than a laptop).

i haven't hacked the a112 yet, though i will, although i must confess
i didn't really understand dieter's answer to my question, what are
the advantages of ac coupling? perhaps i should phrase the question
thus: what are the disadvantages of hacking an a112 to record dc?

cheers, stu

> > > Most CV voltages in a modular are bipolar, with envelopes and
> > keyboard
> > > the most noteable exceptions. LFO's, S/H and what not all go through
> > > zero. Or more correctly: *can* go through zero.
> >
> > Yes I know that. And that still does not answer my question really..
> > Let's say we have an pseudo-ideal CV> digital converter. It would
> > work from
> > 0 volts to anything, so no upper limit. (Just assume this..)
> > I would shift the CV up by the amount it needs to have the most
>
> In some way you are right, yes.
>
> There are certain CV's which don't yield the same result when "pulled
> down" with a negative bias (like, say, a negative halfwave rectifier),
> but that's not where your theory goes a bit wrong... It's in your
> assumption that there's no upper [voltage] limit [as a way of
> reasoning this through], and that the maximum required voltage is only
> 5 volts. Most, but not all, analog modular systems require +10V to use
> their full range (pitch is a good example). This would mean that your
> device should be able to output +20V to pull that voltage down to the
> required maximum range of +10V (and an additional -10V to have
> bipolarity). Now, what is going to happen when you don't need
> bipolarity ? You are going to send a signal ranging from zero to +20
> volts to the CV inputs of your system ? I'd rather not do that.

No.. me neither but then again I was talking purely hypothetical. ;-)

This is indeed a fascinating subject. And I am very glad that a lot of
people are discussing this now!
Several years ago, when I just joined this list, I was talking about
recording CVs via a method I learned during my studies and how to
implement this with a eurorack system.
People were very much responding "why would you want to do this, there is midi".
I decided to not really push it then..

The method actually was: modulating a VCO with the cv you want to
record and recording that VCO's output. Sending that recording to a
frequency demodulator. And the output would be the CV again. Or at
least something fairy similar.

I now see that it might be possible these days since Analogue Systems
had released their RS35.
For what I believe I read in the manual this is a device that actually
outputs a bi-polar cv in the range of -10v to +6v.

(A word on the studio I studied: They have ALL their control voltages
in the DC range. So no bi-polar hassles there.
Everything is custom build.)

> i haven't hacked the a112 yet, though i will, although i must confess
> i didn't really understand dieter's answer to my question, what are
> the advantages of ac coupling? perhaps i should phrase the question
> thus: what are the disadvantages of hacking an a112 to record dc?
>
> cheers, stu

In this case the A-112 output has a positive voltage offset (~ +2.5V), i.e.
if the A-112 is used for audio the voltage does no longer swing around 0V
(GND) as usual but around +2.5V. If you process this signal e.g. by a (DC
coupled) VCA like the new versions of A-130/A-131 or A-132-3 you will obtain
kind of a bump even without a present audio signal because the VCA processes
the +2.5V offset voltage. If you want to use the A-112 for both audio and CV
recording I'd recommend a switch for AC/DC coupling to avoid this drawback.

Best wishes
Dieter Doepfer

Thank you Dieter!
Taking out the square waves from the lfos is also a great idea, so I will probably do that as well.


--- On Mon, 1/19/09, yahoo@doepfer.de <yahoo@doepfer.de> wrote:

> From: yahoo@doepfer.de <yahoo@doepfer.de>
> Subject: AW: [Doepfer_a100] A-127 as triple LFO?
> To: Doepfer_a100@yahoogroups.com
> Date: Monday, January 19, 2009, 10:21 AM
> > Hi! I'm thinking about getting an A-127 Triple VC
> Resonance
> > Filter for my system, and as I tend to use a lot of
> LFOs for slow
> > sweeps of different parameters, I got the idea of
> bringing out
> > the 3 internal LFOs of the A-127 to separate jacks on
> a 4HP blind
> > panel next to the module. This would give the A-127 a
> second
> > function as a simple "triple triangle LFO"
> when not used as a
> > filter. Would this be as easy as just taking the
> signals from the
> > switched terminals of the ext. CV jacks on the A-127?
> Is there
> > anything more I should do, like using output
> protection resistors?
> >
> > Also, does anyone know/have a good demo of the A-127?
> >
> > Thanks for your help!
> >
> > /Henrik Medquist
> 
> The LFO outputs are available at pin 7 (triangle) and pin 8
> (rectangle) of
> the TL084. 1k protection resistors should be used to
> connect these pins to
> the additional sockets. And a simple voltage divider made
> of two resistors
> is recommended for the rectangle output because pin 8
> outputs about +/-11V
> (i.e. ~ 22V overall voltage level).
> 
> Best wishes
> Dieter Doepfer

Looking to have some diy modules with a doepfer system and was wondering if anyone has any p/n for suitable pin headers and ribbon cable for the doepfer disto board?
Mouser or Digikey numbers would be best as I am in the states.

thanks,
b.


[Non-text portions of this message have been removed]

Hi all,
Wondering if anyone here has done this mod?

I'm not sure whether I should be:
a) leaving the capacitor in place & soldering the legs together, 
b) removing the capacitor & replacing it with a wire, 
or c) removing the capacitor & not putting anything in its place.

Any clarification would be greatly appreciated


Thanks for the help.

Cheers,
Mark


--- In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:

>
> The A-112 can be modified very easily for DC coupling: short capacitor C11
> (100nF, next to the TL064).
> 
> Best wishes
> Dieter Doepfer
> 
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> > [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von brian
> > Gesendet: Donnerstag, 22. Januar 2009 22:26
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: Re: [Doepfer_a100] a-112 - cv recording?
> >
> >
> > Hello,
> >
> > I am a very new user to the euro world and have a couple modules
> > so far but recently got an A-112 second hand.  My time with it
> > has only been about 1 hour so far but was wondering if it is
> > possible to record CV data as opposed to audio.  It seems like I
> > was able to get quick swells from a slew-as-envelope but when I
> > slowed  the timing down it didn't seem to work.  I am currently
> > waiting on some proper lfo/adsr to fully test it but wanted to
> > see if any of you have any info.  Likewise, if it is not set-up
> > to do so currently is there a possible mod to allow CV recording?
> >
> > Thanks,
> > b.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>

> Hi all,
> Wondering if anyone here has done this mod?
>
> I'm not sure whether I should be:
> a) leaving the capacitor in place & soldering the legs together,
> b) removing the capacitor & replacing it with a wire,
> or c) removing the capacitor & not putting anything in its place.
>
> Any clarification would be greatly appreciated…
>
> Thanks for the help.
>
> Cheers,
> Mark

The easiest way is to leave the capacitor in place and make a short circuit
by means of solder. Pay attention that you will obtain an DC offset after
this mod.

Best wishes
Dieter Doepfer

Perfect, thanks so much!

Cheers,
Mark


--- In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:

>
> > Hi all,
> > Wondering if anyone here has done this mod?
> >
> > I'm not sure whether I should be:
> > a) leaving the capacitor in place & soldering the legs together,
> > b) removing the capacitor & replacing it with a wire,
> > or c) removing the capacitor & not putting anything in its place.
> >
> > Any clarification would be greatly appreciated

> >
> > Thanks for the help.
> >
> > Cheers,
> > Mark
> 
> The easiest way is to leave the capacitor in place and make a short circuit
> by means of solder. Pay attention that you will obtain an DC offset after
> this mod.
> 
> Best wishes
> Dieter Doepfer
>