Doepfer

Enter your vote today!  A new poll has been created for the 
Doepfer_a100 group:

Would you like doepfer to release a 
Sequencer with CV for 
forward/backward/random? 

  o Yes 
  o No 
  o Maybe 


To vote, please visit the following web page:

http://groups.yahoo.com/group/Doepfer_a100/surveys?id=10952516  

Note: Please do not reply to this message. Poll votes are 
not collected via email. To vote, you must go to the Yahoo! Groups 
web site listed above.

Thanks!

I have to agree with Florian - an update to the A155 would make a very 
interesting discussion, but I think asking whether just this one new 
feature should be added doesn't make sense.

Joe

--- In Doepfer_a100@y..., Florian Anwander <Florian.Anwander@c...> 
wrote:
> Hi 
> 
> > Enter your vote today!  A new poll has been created for the
> > Doepfer_a100 group:
> > 
> > Would you like doepfer to release a
> > Sequencer with CV for
> > forward/backward/random?
> I don't know, who entered this poll without a discussion in the 
list, but
> my 2c:
> 
> I would appreciate this feature of course. But I think a second 
sequencer
> module with only a minor change against the A155 is economical 
nonsense. No
> producer will do that, and I am sure Doepfer won't do that too.
> 
> And a second hint. I don't know the exact schematics of the A155, 
but
> usually the VC-switch between forward/backward is a very easy thing.
> Perhaps only an additional input has to be added; perhaps 
additionally the
> counter has to be replaced. But both mods are quite easy electronic 
work,
> which can be done with material for 5 EUR and everyone who can 
distinguish
> the end from the tip of a soldering iron should be able to do this.
> 
> Adding a random clock is something completely different. It could be
> realized by a Sample&Hold Module and after that an simple 3Bit or 
4Bit
> AD-Converter. Perhaps this Simple ADC would be an interesting 
module.
> 
> If you want both, the assumingly easiest way should be a PIC with an
> AD-Converter for the selection-CV.
> 
> Florian
> -- 
> Florian Anwander                  |ConSol*  HP-Support
> Tel.   +49.89.45841-133           |Consulting&Solutions Software 
GmbH
> Fax    +49.89.45841-139           |Franziskanerstr. 38, D-81669 
München
> email: florian.anwander@c... |http://www.consol.de

> Adding a random clock is something completely different. It 
could be
> realized by a Sample&Hold Module and after that an simple 
3Bit or 4Bit
> AD-Converter. Perhaps this Simple ADC would be an 
interesting module.
> 
> If you want both, the assumingly easiest way should be a PIC 
with an
> AD-Converter for the selection-CV.


this may not result in a 'true' random step feature but as 
discussed a while back on the list, if you clock your a155 w a 
sawtooth (or perhaps other nonsymmetrical waves) it steps in a 
semirandom manner..

also, these suggested features might be simple enough for 
doepfer to include on future a155s.  at that point, i imagine it 
would be pretty easy for many existing users to reverse engineer 
an 'old' a155. 

i think a trigger input for fwd and a trigger input for reverse would 
be nice.
-duff

Hi 

> Enter your vote today!  A new poll has been created for the
> Doepfer_a100 group:
> 
> Would you like doepfer to release a
> Sequencer with CV for
> forward/backward/random?
I don't know, who entered this poll without a discussion in the list, but
my 2c:

I would appreciate this feature of course. But I think a second sequencer
module with only a minor change against the A155 is economical nonsense. No
producer will do that, and I am sure Doepfer won't do that too.

And a second hint. I don't know the exact schematics of the A155, but
usually the VC-switch between forward/backward is a very easy thing.
Perhaps only an additional input has to be added; perhaps additionally the
counter has to be replaced. But both mods are quite easy electronic work,
which can be done with material for 5 EUR and everyone who can distinguish
the end from the tip of a soldering iron should be able to do this.

Adding a random clock is something completely different. It could be
realized by a Sample&Hold Module and after that an simple 3Bit or 4Bit
AD-Converter. Perhaps this Simple ADC would be an interesting module.

If you want both, the assumingly easiest way should be a PIC with an
AD-Converter for the selection-CV.

Florian
-- 
Florian Anwander                  |ConSol*  HP-Support
Tel.   +49.89.45841-133           |Consulting&Solutions Software GmbH
Fax    +49.89.45841-139           |Franziskanerstr. 38, D-81669 München
email: florian.anwander@consol.de |http://www.consol.de

hi list,
i agree with you...a new sequencer module just for
forward/backwards/random mode doesn't make sense.
bakis.


--- duffnuff <duffnuff@hotmail.com> wrote:
> 
> 
> > Adding a random clock is something completely
> different. It 
> could be
> > realized by a Sample&Hold Module and after that an
> simple 
> 3Bit or 4Bit
> > AD-Converter. Perhaps this Simple ADC would be an 
> interesting module.
> > 
> > If you want both, the assumingly easiest way
> should be a PIC 
> with an
> > AD-Converter for the selection-CV.
> 
> 
> this may not result in a 'true' random step feature
> but as 
> discussed a while back on the list, if you clock
> your a155 w a 
> sawtooth (or perhaps other nonsymmetrical waves) it
> steps in a 
> semirandom manner..
> 
> also, these suggested features might be simple
> enough for 
> doepfer to include on future a155s.  at that point,
> i imagine it 
> would be pretty easy for many existing users to
> reverse engineer 
> an 'old' a155. 
> 
> i think a trigger input for fwd and a trigger input
> for reverse would 
> be nice.
> -duff
> 
> 


=====
synthfreak(parallel worlds)
athens-greece
[Doepfer_a100] group owner-moderator

__________________________________________________
Do you Yahoo!?
HotJobs - Search new jobs daily now
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So, who in the group offers their services for performing module 
modifications like this?

Joe

--- In Doepfer_a100@y..., bakis Sirros <synth_freak_2000@y...> wrote:

> hi list,
> i agree with you...a new sequencer module just for
> forward/backwards/random mode doesn't make sense.
> bakis.
> 
> 
> --- duffnuff <duffnuff@h...> wrote:
> > 
> > 
> > > Adding a random clock is something completely
> > different. It 
> > could be
> > > realized by a Sample&Hold Module and after that an
> > simple 
> > 3Bit or 4Bit
> > > AD-Converter. Perhaps this Simple ADC would be an 
> > interesting module.
> > > 
> > > If you want both, the assumingly easiest way
> > should be a PIC 
> > with an
> > > AD-Converter for the selection-CV.
> > 
> > 
> > this may not result in a 'true' random step feature
> > but as 
> > discussed a while back on the list, if you clock
> > your a155 w a 
> > sawtooth (or perhaps other nonsymmetrical waves) it
> > steps in a 
> > semirandom manner..
> > 
> > also, these suggested features might be simple
> > enough for 
> > doepfer to include on future a155s.  at that point,
> > i imagine it 
> > would be pretty easy for many existing users to
> > reverse engineer 
> > an 'old' a155. 
> > 
> > i think a trigger input for fwd and a trigger input
> > for reverse would 
> > be nice.
> > -duff
> > 
> > 
> 
> 
> =====
> synthfreak(parallel worlds)
> athens-greece
> [Doepfer_a100] group owner-moderator
> 
> __________________________________________________
> Do you Yahoo!?
> HotJobs - Search new jobs daily now
> http://hotjobs.yahoo.com/

> So, who in the group offers their services for performing module 
> modifications like this?

Well, I'd love to be able to offer an opinion based on knowledge of 
the circuit, and then who knows, possibly a suggestion for a mod or 
two. Unfortunately the 155 is among the modules I don't possess, so 
if anyone out there has traced the circuit (this takes dedication, 
especially on something of the 155's size!) or has access to the 
schematic and is willing to share it, I'll happily spend some time 
looking at what makes it tick.

If the main switching logic is something like a 4024 counter driving 
a 4051 analogue multiplexer (someone who has one could seek out these 
nos. on the chips?), then Florian's suggestions for changing the 
clock direction might be reasonably straightforward. If the circuit 
is of this form, then this also suggests to me a (conceptually) easy 
way to make it random - feed separate random sequences (like a slowed 
down 117) to the 3 control pins on the 4051. It might even be 
possible to do this with just one shift register producing the random 
sequence, rather than three separate ones. But without seeing the 
schematic, this is pure conjecture...

Tim

one of the least talked about features and much less implemented in 
sequencers is Analogue Selction. you basically have an input where an 
applied control voltage selects the stage. very powerful function. I 
mentioned this feature in the touch sequencer keyboard poll. hope it 
becomes a reality.

RM




--- In Doepfer_a100@y..., "Joe Buechler" <buechlerjoe@t...> wrote:
> I have to agree with Florian - an update to the A155 would make a 
very 
> interesting discussion, but I think asking whether just this one 
new 
> feature should be added doesn't make sense.
> 
> Joe
> 
> --- In Doepfer_a100@y..., Florian Anwander <Florian.Anwander@c...> 
> wrote:
> > Hi 
> > 
> > > Enter your vote today!  A new poll has been created for the
> > > Doepfer_a100 group:
> > > 
> > > Would you like doepfer to release a
> > > Sequencer with CV for
> > > forward/backward/random?
> > I don't know, who entered this poll without a discussion in the 
> list, but
> > my 2c:
> > 
> > I would appreciate this feature of course. But I think a second 
> sequencer
> > module with only a minor change against the A155 is economical 
> nonsense. No
> > producer will do that, and I am sure Doepfer won't do that too.
> > 
> > And a second hint. I don't know the exact schematics of the A155, 
> but
> > usually the VC-switch between forward/backward is a very easy 
thing.
> > Perhaps only an additional input has to be added; perhaps 
> additionally the
> > counter has to be replaced. But both mods are quite easy 
electronic 
> work,
> > which can be done with material for 5 EUR and everyone who can 
> distinguish
> > the end from the tip of a soldering iron should be able to do 
this.
> > 
> > Adding a random clock is something completely different. It could 
be
> > realized by a Sample&Hold Module and after that an simple 3Bit or 
> 4Bit
> > AD-Converter. Perhaps this Simple ADC would be an interesting 
> module.
> > 
> > If you want both, the assumingly easiest way should be a PIC with 
an

> > AD-Converter for the selection-CV.
> > 
> > Florian
> > -- 
> > Florian Anwander                  |ConSol*  HP-Support
> > Tel.   +49.89.45841-133           |Consulting&Solutions Software 
> GmbH
> > Fax    +49.89.45841-139           |Franziskanerstr. 38, D-81669 
> München
> > email: florian.anwander@c... |http://www.consol.de

Hi ringmod45 

> one of the least talked about features and much less implemented in
> sequencers is Analogue Selction. you basically have an input where an
> applied control voltage selects the stage. very powerful function. I
> mentioned this feature in the touch sequencer keyboard poll. hope it
> becomes a reality.
also this could be done with a simple ADC, which converts the CV into
Digital adressing oft the mulitplexer. Looks like the ADC would be a really
interesting module.

Florian
-- 
Florian Anwander                  |ConSol*  HP-Support
Tel.   +49.89.45841-133           |Consulting&Solutions Software GmbH
Fax    +49.89.45841-139           |Franziskanerstr. 38, D-81669 München
email: florian.anwander@consol.de |http://www.consol.de