Well, I still think it depends on Doepfer if and how polyphonic control could be arranged. I have read the thread you mentioned and it is totally making sense but still I think the extra expense would be worth it. I am curious about Dieters thoughts about this...

--- In Doepfer_a100@yahoogroups.com , Florian Anwander <fanwander@...> wrote:
>
> Hello Pulsquare
>
>
> > So we need exact information on how to do it and if it is possible anyway considering the way the synth board is built. Maybe it could be realized by a Doepfer daughter board or DIY board with 'how to' instructions by Dieter. Anyhow this would be awesome.
> You should read the complete old thread (you can do this at the yahoo
> web site:
> http://launch.groups.yahoo.com/group/Doepfer_a100/messages/20261 xm=1&o=0&l=1
> beginning with message 20272).
>
> It is not possible with adequate effort. For the control of several
> voices with the same potentiometer all parameters MUST be voltage
> controlled (the potentiometer creates a voltage and this voltage is
> received by the different voices). But at the diy board only a few basic
> parameters are voltage controlled. The major part of parameters depends
> direct on the resistance of the potentiometer. You would have to add a
> lot of VCAs and VCRs. If you would be able to do this, you would be able
> to create a real fully voltage controlled synth on your own, and would
> not need the doepfer voice (and also you would not ask here, because you
> would know this already ;-) ).
>
> The only kind of a polyphonic synth you can build with the diy-synths is
> something like the old Oberheim Fourvoice, where each voice has its
> complete set of potentiometers.
>
> Florian
>