Hi, You should check the output voltage on the wiper contact of the filter cutoff potentiometer. It should read +5V at maximum and -5V at minimum rotation. See what the reading is when the knob is set to a 'trouble' spot. That will help determine if the pot itself is dirty. Crow /**/
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Re: [PolySix] VCF cutoff quirkiness
2004-07-20 by The Old Crow