moog prodigy audio input mod

[Goddard, Duncan]

I've done lots of "terrible" things to my prodigys, just using the schematic
and some common sense- it's quite easy, for instance, to pwm the oscillators
from the filter envelope just with one bit of wire.... 
one of them has two crude sub-oscillators, 4013's I think, which were in the
synth when I got it. they are just mixed in with the other oscillators via
toggle switches. the older of the two had only one 1/4" socket- audio out,
while the more recent has this funny looking s-trig socket, like a minimoog,
and 1/4" for filter cv, keyboard in/out and something else- a footswitch for
syncing/unsyncing the oscillators. all but this last can easily be added to
an older prodigal, even without the map, because the board is marked where
the wires to these sockets would have gone.

other stuff that I've done to the older prodigy: 
range control for the pitch wheel, which has also had it's pins removed. in
the "normal" position, the range of the pitch wheel is what you'd expect.
changing to the other position allows a greater voltage swing which, coupled
with being able to move the wheel round further, makes squeaks and buzzes
you'd normally not be able to get from the oscillators. they track very well
way beyond their normal range.
range control for lfo- a toggle switch and a different capacitor in the lfo
circuit so it goes about ten times faster- some nice ring-mod/fm type
noises. I may yet get the oscillators to mod each other but normally I'd use
the pro-1 or the cs30 to make noises like that.
triggering from the lfo, via a toggle switch.
the newer one has both oscillators running at the same frequency, i.e. they
are no longer an octave apart. it means that when they are set an octave
apart, one can choose between square and pulse more flexibly. since we use
this one mostly for basslines, the loss of the top octave from one
oscillator was a fair trade-off.

duncan.


> ----------
> From: 	skinny bastard[SMTP:skin_job at hotmail.com]
> Sent: 	15 August 2000 05:53
> To: 	synth-diy at node12b53.a2000.nl
> Subject: 	moog prodigy audio input mod
> 
> Was at a friend's house playing with his prodigy tonight, and I noticed
> (to 
> my dismay) that because of the absence of a cv out, I couldn't interface
> my 
> MOTM with his prodigy. We started talking about possibly modifying his 
> prodigy, and we found several resources.
> 
> One: machines.hyperreal.org has an audio input mod as well as a cv and
> gate 
> mod. Does anyone see any drawbacks to the way the mods are set up here?
> 
> Two: Analogue Solutions sells a kit (at a price way too high) to turn your
> 
> prodigy into a (almost) full modular system. I'd much rather do this
> myself 
> using quality components (ie: switchcraft jacks). Anyone out there have a 
> guide on how to do the rest of the input/output mods?
> 
> Thanks,
> the skin_job
> ________________________________________________________________________
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