I made a PCB for a diode ladder filter.
The template was the YuSynth EMS clone.
My problem now is that the filter is permanently oscillated as if the resonance pot were fully turned on,
even if resonance is fully turned to the left.
The voltage at the gate terminal of the N channel j-fets is in the correct range between -0.1V and -2.4V.
The oscillation stops when I supply a negative voltage at RES-CV input.
While the voltage is applied, the Resonace potentiometer behaves normally.
I have already tried to reduce R31 to 220k without success.
Can someone tell me where the problem lies?
I attach the complete schematic in the appendix