antto wrote:make sure you're using the right adaptor - 9V AC around 300 to 600mA ... you might also want to measure it's output (with multimeter in AC Voltage mode) to see if it's not terribly off or something
i'd also look around the IO-board closely, for anything suspicios
if this issue only affects the VCO but not the VCF tuning - it could be somewhere in the VCO section instead
did you try sweeping the TUNE knob to see if it shifts the vco pitch smoothly?
x0xjesus wrote:I put a sample WAV file here which contains an example of the pitch changing by itself:
MMM wrote:Otherwise it sounds to me like a possible cold solder joint. You may want to check the CV output when that happens - if that is consistent the problem is probably not with the 5.33v.
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