korg-35 apparently works

[jhaible]

It works.

Couldn't await it, went to the breadboard right after I sent that mail.
I made minor changes (forgot the 33u at the output, and a 4M7
resistor parallel to opamp input).
Test was very short so far, but it sounds very much like a MS-20
filter. Typical interaction of self oscillation with high level input
signal.
Bingo !

It cannot be the whole Korg-35 chip, though. 
PS-3200 uses it without external opamp, but still has resonance.
Must at least have an internal buffer.

Someone prevent me from dreaming of a PS clone now !!

JH.