>
> > ideally I want to make a two voice --what should I buy
> >
> > http://www.audiomidi.com/Synthesizer-Expander-Module-with-MIDI-to-
> CV-Panel-P12455.aspx
> >
> > http://www.audiomidi.com/Synthesizer-Expander-Module-with-Patch-
> Panel-P12454.aspx
> >
> >
> >
> > thanks in advance
> > David

Considering this is a modular forum I think the MIDI to CV panel
version would be the least popular of the 3 choices available.
But you do have an interesting and tricky question given you want to
eventually make a two voice.

Do you already have a MIDI to CV interface That's obviously and
important piece of info though some people don't use a keyboard by
choice (though by you asking this question I'm pretty sure you aren't
one) and some rare people have a native CV keyboard already and don't
use MIDI, but that's rare.

I assume you want to play duophonically, you know, have 2 different
keys play 2 different notes one to a SEM rather than have 2 voices in
unison For two voices in unison the answers is fairly simple, get
one of each.

Right now I'm not reading about Tom Oberheim having a polyphonic
strategy for his new SEMs. Some monophonic units have a switchable
feature that counts voices in polyphony by some means so you could
make several mono instruments behave respond like a poly instrument
when properly configured. But I'm not seeing that reading the specs.
Maybe someone who has a new SEM has found it.

So if I'm correct and Tom is taking things a step at a time rather
than having a bigger plan I see the following possibilities.

A) right now one could build a MAX patch or similar custom program on
a computer to turn a polyphonic line into multiple MIDI channels in
real time. There might be something hardware or software to do that
but I don't know of one. One could also get an external MIDI to CV
interface that does multiple channels. The ones that do will have a
mode for polyphony. I actually have a seemingly very rare 1980s JL
Cooper 8 voice MIDI to CV unit that seems to have been designed
partly or mostly for Oberheim 8 Voice owners and I guess people with
many monosynths. Given there are not that many I doubt many units
were built or sold though obviously someone bought my second hand unit.

B) Tom Oberheim might release an update to his midi to cv that does
some sort of skipping, if I'm assuming correctly that his doesn't now
and there are no hardware limitations that stop him.

C) Tom Oberheim or some third party releases a poly hardware
solution. Maybe a chassis for SEMs with additional hardware Maybe a
4th version with master features

nick