We should check the signalpath with an scope, where this unwanted signal
can be located the earliest, and then the control voltages.
Check with an: VCO Out, VCF Out (change the cutoff while checking), VCA
Out (turn cutoff down while checking), Chorusboard out (with cutoff down).
Then check the control voltages:
VCO Pitch and Modulation CV
VCF Cutoff at pin 13 of 2044
VCA at R133
My personal suspect is now a multiplexer for a CV or the gate latches.
Florian
Am 06.09.2015 um 10:48 schrieb Eoin O'Callaghan
cliofreak@yahoo.com [PolySix]:
> I agree. This seems to be a more complex sound than interference. Id say
> there is a ground issue somewhere in there and is seen in action when
> keyboard is lifted in and out BUT I d say you're right...there is
> something else at play here.
>
>