via this auction
"It has midi professionally installed which lets you run the MC202 off your midi sequences instead of having to tediously program with the internal sequencer. Everything works perfectly and it looks great as well. Comes with original box! Nice collector's item. The midi upgrade along costs $250, and Mc-202's regularly go for up to $600. See pictures below.
Have midi installed in this is great, it gives you several improvements.
There are two midi modes:Mode 1 Regular CV - you can run both cv/gate in and out from the 202. The 202 keypad works.
Mode 2 Midi mode channel 1- runs the mc202 with the midi AND lets you use it as a midi-cv converter. CV in is disabled in this mode and the keypad is disabled. The best part is portamento will be in effect if you turn the knob and trigger it with midi (similar to what an sh-101 can do if you run it on cv/gate).
Then each time you press the little button on the front, the assigned midi channel goes up 1. So if you are in mode 2 and press the button 3 times, midi in is received on channel 4.
To reset to mode 1, you hold the button for a couple of seconds.
The only downside is there is no compartment for batteries, as that's where the midi was installed, but considering the added midi-cv capabilities, it's not a big loss. Also, when triggering the mc202 with an external cv/gate, I find there is a slight delay in the note, which I have read is due to the internal wiring which goes through a microprocessor. The midi in solves this issue as it triggers the notes right away.
Power supply is not included, but it runs off any standard 9v adapter."
