Doepfer

Hi,

I suggest a Reamping/ext-in/DI-Module (A-119-2 ?). What for is it?

If you send a line signal from the A-100 to an external guitar stomp box 
effect the line level of the signal will cause the guitar effect to 
distort. Also the output signal of the effect will have wrong impedance 
for the inputs of the moduls. While the second problem mostly might be 
neglectable, the first one will cause distortions in the effects.

Solution: A module which provides two or three functions:
1.) Re-Amping - change the impedance to guitar level
2.) ext-in - adopt signals with instrument impedance/level to the 
linelevel of the A-100
3.) DI - this module could be used perhaps also as real DI-Box

I could also imagine that this module and an additional, more 
sophisticated envelope follower (with controls fo seperated 
up/down-slewrates, threshold, hysteresis settings, and an insert between 
envelope follower and gate follower) may replace the existing A-119.

Florian

That's a great idea Florian.
 
I use various stomp boxes with my system and it's a pain getting level's
right for a clean signal.
 
I'll take a couple of those for sure.
 
Either that or provide send and returns within a CV mixer with a switch
for changing impedance?
 
Rgds
 
david
 
David Salter
Senior Consultant
PSG 

Reuters Messaging: david.salter.reuters.com@reuters.net
(t) +44 (0)20 7542 2402 | (m) 07990562402 | (f) 52699 

Get the latest news at Reuters.com <http://www.reuters.com/> 

 

________________________________

From: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
On Behalf Of Florian Anwander
Sent: 01 June 2007 09:58
To: A100
Subject: [Doepfer_a100] Suggestion: Re-Amping/DI module



Hi,

I suggest a Reamping/ext-in/DI-Module (A-119-2 ?). What for is it?

If you send a line signal from the A-100 to an external guitar stomp box

effect the line level of the signal will cause the guitar effect to 
distort. Also the output signal of the effect will have wrong impedance 
for the inputs of the moduls. While the second problem mostly might be 
neglectable, the first one will cause distortions in the effects.

Solution: A module which provides two or three functions:
1.) Re-Amping - change the impedance to guitar level
2.) ext-in - adopt signals with instrument impedance/level to the 
linelevel of the A-100
3.) DI - this module could be used perhaps also as real DI-Box

I could also imagine that this module and an additional, more 
sophisticated envelope follower (with controls fo seperated 
up/down-slewrates, threshold, hysteresis settings, and an insert between

envelope follower and gate follower) may replace the existing A-119.

Florian



 


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

You can use a VCA to attenuate the signal to line level, and the existing
119 ext. input to beef it back up to modular levels again. But yes, I can
also see how this sort of module could be handy, and you could probably even
fit two of them on an 8HP panel if you just needed out and in each with a
level pot - or four on a 4HP panel (narrowest quad-module ever!) if you only
needed I/O and no level pots. I'd probably go for a version with level pots,
though, as that would be much more versatile.

/Silas

On 6/1/07, Florian Anwander <Florian.Anwander@consol.de> wrote:
>
>   Hi,
>
> I suggest a Reamping/ext-in/DI-Module (A-119-2 ?). What for is it?
>
> If you send a line signal from the A-100 to an external guitar stomp box
> effect the line level of the signal will cause the guitar effect to
> distort. Also the output signal of the effect will have wrong impedance
> for the inputs of the moduls. While the second problem mostly might be
> neglectable, the first one will cause distortions in the effects.
>
> Solution: A module which provides two or three functions:
> 1.) Re-Amping - change the impedance to guitar level
> 2.) ext-in - adopt signals with instrument impedance/level to the
> linelevel of the A-100
> 3.) DI - this module could be used perhaps also as real DI-Box
>
> I could also imagine that this module and an additional, more
> sophisticated envelope follower (with controls fo seperated
> up/down-slewrates, threshold, hysteresis settings, and an insert between
> envelope follower and gate follower) may replace the existing A-119.
>
> Florian
>
>  
>


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

Hi Silas

> You can use a VCA to attenuate the signal to line level, 
How do you change the impedance of an A-100 output with an VCA? Are you 
aware of of the difference between impedance and signal level?

Florian

Hi Florian,

Does a VCA output have an impedance? I would expect it to have a level and
to expect an impedance within a certain range of the input that it connects
to, whereas impedance is a term that I mostly see in reference to inputs and
(sometimes) passive outputs (e.g. dynamic microphones or guitar pickups).
But then, I'm not an electronics engineer...

/Silas

On 6/1/07, Florian Anwander <Florian.Anwander@consol.de> wrote:
>
>   Hi Silas
>
> > You can use a VCA to attenuate the signal to line level,
> How do you change the impedance of an A-100 output with an VCA? Are you
> aware of of the difference between impedance and signal level?
>
> Florian
>  
>


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

Hi Silas

> Does a VCA output have an impedance? 
Of course :-). Each signal output has an impedance. It does not matter, 
whether the signal is generated electromechanical by a microphone or 
electronical by a synth module.

The impedance can be seen as the AC equivalent to a DC resistance which 
could be determined by the voltage of the signal and the current that 
flows when sending the signal (you rememeber good old Georg Ohm's law).


Florian

Hi Florian,

Hmm... but if I remember my Ohms law correctly that would mean that the
impedance would be determined entirely by the level of the signal and the
resistance of the input in the stomp box. Hence, using a VCA to change the
signal level would also change the impedance. Or am I missing something
here?

Sorry if I'm pestering you, but I'm actually genuinely interested in knowing
more about this sort of stuff.

Silas

On 6/1/07, Florian Anwander <Florian.Anwander@consol.de> wrote:
>
>   Hi Silas
>
> > Does a VCA output have an impedance?
> Of course :-). Each signal output has an impedance. It does not matter,
> whether the signal is generated electromechanical by a microphone or
> electronical by a synth module.
>
> The impedance can be seen as the AC equivalent to a DC resistance which
> could be determined by the voltage of the signal and the current that
> flows when sending the signal (you rememeber good old Georg Ohm's law).
>
> Florian
>  
>


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

just wanted to add my vote for florian's module (don't remember much about 
impedances). my main problems are all associated with ins and outs, unspectacular 
problems, but ones that i have in nearly every setup.

if the following were available, i'd be wishlessly happy:

preamp with several 6.3mm inputs = a119s without gates and stuff
florian's out/in module (or in/out)
flexible output options (see a135-2)

however, i'd hate to see the a119 as it is disappear from the programme, since it 
encapsulates everything i need for one guitar (or whatever) input.

it's just that we have so many guitars :-]

cheers,

stu


--- In Doepfer_a100@yahoogroups.com, "Silas Johansen" <sijodk@...> wrote:

>
> Hi Florian,
> 
> Hmm... but if I remember my Ohms law correctly that would mean that the
> impedance would be determined entirely by the level of the signal and the
> resistance of the input in the stomp box. Hence, using a VCA to change the
> signal level would also change the impedance. Or am I missing something
> here?
> 
> Sorry if I'm pestering you, but I'm actually genuinely interested in knowing
> more about this sort of stuff.
> 
> Silas
> 
> On 6/1/07, Florian Anwander <Florian.Anwander@...> wrote:
> >
> >   Hi Silas
> >
> > > Does a VCA output have an impedance?
> > Of course :-). Each signal output has an impedance. It does not matter,
> > whether the signal is generated electromechanical by a microphone or
> > electronical by a synth module.
> >
> > The impedance can be seen as the AC equivalent to a DC resistance which
> > could be determined by the voltage of the signal and the current that
> > flows when sending the signal (you rememeber good old Georg Ohm's law).
> >
> > Florian
> >  
> >
> 
> 
> [Non-text portions of this message have been removed]
>

Hi,

on analogue heaven maillist I received the hint, that such a module 
already exists in Ken Stones CGS-System:

http://www.cgs.synth.net/modules/cgs60_sba.html


Best regards, Florian

Florian Anwander wrote:

> Hi,
> 
> I suggest a Reamping/ext-in/DI-Module (A-119-2 ?). What for is it?
> 
> If you send a line signal from the A-100 to an external guitar stomp box 
> effect the line level of the signal will cause the guitar effect to 
> distort. Also the output signal of the effect will have wrong impedance 
> for the inputs of the moduls. While the second problem mostly might be 
> neglectable, the first one will cause distortions in the effects.
> 
> Solution: A module which provides two or three functions:
> 1.) Re-Amping - change the impedance to guitar level
> 2.) ext-in - adopt signals with instrument impedance/level to the 
> linelevel of the A-100
> 3.) DI - this module could be used perhaps also as real DI-Box
> 
> I could also imagine that this module and an additional, more 
> sophisticated envelope follower (with controls fo seperated 
> up/down-slewrates, threshold, hysteresis settings, and an insert between 
> envelope follower and gate follower) may replace the existing A-119.
> 
> Florian
> 
> 

-- 
Florian Anwander                  |ConSol
Tel.   +49(89)45841-133           |Consulting&Solutions Software GmbH
Fax    +49(89)45841-111           |Franziskanerstr. 38, D-81669 München
email: florian.anwander@consol.de |http://www.consol.de

Nice find Florian and simple enough, I assume it will work just as well with +/- 12V?
 
Cheers
 
David
 
David Salter
Senior Consultant
PSG 

Reuters Messaging: david.salter.reuters.com@reuters.net
(t) +44 (0)20 7542 2402 | (m) 07990562402 | (f) 52699 

Get the latest news at Reuters.com <http://www.reuters.com/> 

 

________________________________

From: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] On Behalf Of Florian Anwander
Sent: 04 June 2007 09:48
To: A100
Subject: [Doepfer_a100] Re: Suggestion: Re-Amping/DI module



Hi,

on analogue heaven maillist I received the hint, that such a module 
already exists in Ken Stones CGS-System:

http://www.cgs.synth.net/modules/cgs60_sba.html <http://www.cgs.synth.net/modules/cgs60_sba.html> 

Best regards, Florian

Florian Anwander wrote:

> Hi,
> 
> I suggest a Reamping/ext-in/DI-Module (A-119-2 ?). What for is it?
> 
> If you send a line signal from the A-100 to an external guitar stomp box 
> effect the line level of the signal will cause the guitar effect to 
> distort. Also the output signal of the effect will have wrong impedance 
> for the inputs of the moduls. While the second problem mostly might be 
> neglectable, the first one will cause distortions in the effects.
> 
> Solution: A module which provides two or three functions:
> 1.) Re-Amping - change the impedance to guitar level
> 2.) ext-in - adopt signals with instrument impedance/level to the 
> linelevel of the A-100
> 3.) DI - this module could be used perhaps also as real DI-Box
> 
> I could also imagine that this module and an additional, more 
> sophisticated envelope follower (with controls fo seperated 
> up/down-slewrates, threshold, hysteresis settings, and an insert between 
> envelope follower and gate follower) may replace the existing A-119.
> 
> Florian
> 
> 

-- 
Florian Anwander |ConSol
Tel. +49(89)45841-133 |Consulting&Solutions Software GmbH
Fax +49(89)45841-111 |Franziskanerstr. 38, D-81669 München
email: florian.anwander@consol.de <mailto:florian.anwander%40consol.de>  |http://www.consol.de <http://www.consol.de> 


 


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To find out more about Reuters visit www.about.reuters.com

Any views expressed in this message are those of the individual sender, 
except where the sender specifically states them to be the views of Reuters Limited.

Reuters Limited is part of the Reuters Group of companies, of which Reuters Group PLC is the ultimate parent company.
Reuters Group PLC - Registered office address: The Reuters Building, South Colonnade, Canary Wharf, London E14 5EP, United Kingdom
Registered No: 3296375
Registered in England and Wales



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