[sdiy] KORG KPR-77 schemo

[Topy]

My friend asked me: "I'd like to trigger separately the instruments of this machine via MIDI. Can you build me a MIDI controller/trigger circuit for my KPR-77 drum machine?"
I answered: "I'll answer to you if you show me the schematic of it!"
:)
The MIDI to trigger circuit is no problem, but I didn't find any information about this drummachine's circuits on the web. Has anybody have schematic of this machine? Especially the trigger inputs of analogue section.

Many thanks!

Topy