Very small amplitude and very "fuzzy? Does it react to the cutoff knob? Does it react to the envelope?
small aplitude yes, because of r62 I assume. Not fuzzy, not affected by anything - it`s the same signal as on the osc pin (only with R62 and c17in between). pure clean sawtooth. It`s the input into the filter section I think. I mean the pin closest to the nearby trimmer TM3.
Ich checked every other pin of Q22 and all pins of Q12 and Q21 and Q13. Oscilloscope at 10 mV - there is no audio signal nowhere in the filter section. just nothing.
What's the situation like on the cathode of D27?
NoteOn: Goes to 12V then back to zero in maybe 50ms
NoteOff: goes to -12V then back to zero in maybe 50ms.