Korg MS-20 Modded

via this auction
"This MS-20 is a one of a kind, uniquely modded. Instead of a CV keyboard, it has tons of added features listed below. These mods add so much depth and flexibility. it takes the Ms-20 to another level! I've gotten sounds out of this that easily match any Arp 2600, and it can do so much more. Combine the three outputs from Osc1 into the mixer and you get insane fat bass lines like a Minimoog. Split original signal with a little reverb signal to get a stereo signal and you get some very nice space to your sound. It's incredible, especially if you have another Ms series synth to connect with it. Definitely a cool piece of gear, but I just don't have room to keep it and already have enough synths as is. Everything part of the original Ms-20 appears to be functional except the LED to the Envelope generator 2 doesn't light up when the envelope is triggered. Should be an easy fix, and doesn't effect the sound. Most mods appear to be working, though there are a couple I can't quite figure out how they work, so maybe you can figure out just what the mods do. Probably the coolest part is having another LFO to mod the lo and hi pass filters, get them going at different rates and it sounds amazing. Also of note, in the mixer section, one knob is missing, but you can still work it fine.

Here are the mods from left to right, described to the best of my ability.
- Touch sensor 1/8 inch jack.
- Midi jack. I haven't quite figured out how to use this, I believe you can trigger with midi, the little figure below the input shows it working for modulation wheel and momentary trigger
- Keyboard 1/4 jack
Touch sensor section:
- Attack release knob, positive or negative waveshape
- Decay amount
- Velocity level
- Touch press level knob, + or +/- SYM switch
Reverb section
- input balance between 1 or 2
- defeat switch
- dry out mix wet
LFO 2 section
- waveform
- frequency (w/ led indicating freq length)
1/4 inch jack modular section on the right:
- Osc1/Osc2 total out
- Osc1 triangle
- Osc1 saw
- Osc1 square/pulse
- Touch A/R
- Touch Press
- Touch Velocity
- EG2 Pos. Out
- LFO2 Triangle/Square
- Reverb 1/2
- Out
Mixer section
- 4 inputs, 1 output
- 4 inputs, 1 output
- 3 inputs, 1 output, with a switch between mix and multi function"