Moog Music Forum

Does anyone know if a voltage difference on the power supply could be causing this thump? I'm measuring 11,9 negative and 11,6 positive voltage over the capacitors c39(-) and c38(+) to ground. The audio output is registering a spike of around 0,2 volts. Is this purely coincidence?

Hi!

I also have a thumping or spike problem. It seems to be affected by Attack and Decay/Release. I can cindof move the "thump on" with attack time. The "thump off" only appears when the key is released prior to the tone decaying out with the decay time.

I adjusted the VCA balance trim, which on ...