Just picked up a 91 Essence. A player but a very nice one. Its got a loud squeal type electronic noise (almost like speaker feed back) when I turn the low pass filter knob to the extreme bright setting. Actually it occurs just before the pot hits the mechanical limit. The squeal is momentary and silences after it passes through this position. The pot actuates smoothly with no mechanical sounds. It seems to be intermittent as well, if I turn the knob quickly I don't get the noise - slowly and I'll get it.
If it was static sounding I'd say it the pot was dirty or been set in the same position for a long time however this sound is an unusual electronic squeak or squeal. If it occurred in a live setting , it would be loud enough to clear the room
Thoughts?
