Korg X-911 synth - MS-20 style audio processing

via this auction
"this is a bit of a rare and strange one. For a start, it has no keyboard, because it's designed to be controlled by other sounds - it's known as a pitch-voltage synth.

What this means is you plug in your signal source (a guitar would be your standard thing this was designed for - but you can plug in anything you want - drum machines, a microphone, the latest britney single) and the X-911 tracks the pitch of what you are playing into it, and then plays that pitch with its built in synth.

which brings us to the other weird part of the X-911 - the synth part.. you have 2 separate sections. one is a basic subtractive synthesiser, and the other half is a bunch of presets. the really nuts thing is, all these presets can be stacked up, and mixed with the synth, to create a massive wall of noise. If you get into the guts of this thing there's some serious electronics packed into it - according to this site this is all the synth bits and pieces contained in this tiny little MS-20 era box

* 1 pre-amp, dist unit, P-V converter and envelope follower/trig detector
* 1 multi-waveform, multi-octave output MS-20-style VCO with both lin and log CV
* 1 MS-20-style VCF
* 3 MS-10-style VCF:s (discrete KORG35) used by the Bass, Tuba and Trumpet presets.
* 8 VCA:s
* 9 simple EG:s


of course, if all this is a bit much for you, the X-911 has CV and trigger jacks in and out, so you can control it from a midi-cv converter, or use it to control a synth with a more vanilla architecture."