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