[Re:[Polyphony, etc....]]

[Harry Bissell]

Harry Bissell writes:

Gene... I'd be glad to share the design with you, but then (since you were a
moog employee) we'd have to kill you. Actually I was going to trace out the
amazing duophonic VCO, but the damn thing was potted in epoxy.... You know how
those old ARP modules were.

And by the way, did you hear the one about the DIY-VCO that played two notes
at once... but not by choice :-) Harry.

All kidding aside, I'd like to see how moog did it... I e-mailed Jason details
about my method but forgot at the last minute to cc Synth-DIY. If he still has
it maybe he can send it up. I use two constant current sources, the resistor
string and I ground taps through the keyswitches... you do the same???? :-)
Harry


Gene Zumchak <zumchak at cerg.com> wrote:
S


> On 27 Apr 99 19:28:41 EDT Harry Bissell <harrybissell at netscape.net>
> writes:
> >Jason: You will receive MANY replies. Here's mine
> >
>
> >    The ARP 2600 was "duophonic" one oscillator could track the
> >highest and
> >lowest key played.
>

Damn.  This is really amazing, Harry.  Could you post the circuit for
the
Oscillator that plays two different notes at a time.  This I've got to
see.

It would be good for anybody on this list to know how a Moog-style
monophonic keyboard works.  ANY
such keyboard can be modified to play two notes, the lowest and highest.

This was first done, to my knowledge, in the Sonic V/VI.  It was
patented.  I
would like to take an hour or two and write a tutorial on how a Moog
keyboard works and how to modify one to make it provide a control
voltage for the second note, except today I have to write an exam to
give tonight and then a final exam to give a week from Monday.  But
someday very soon I will write a keyboard tutorial if anybody expresses
interest.

Gino





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