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Ed, This is a common problem and easily fixed. Behind those knobs are "rotary encoders" and one of yours has gone bad. My Vortex was in this condition when I bought it used a few years back and quick trip back to Lexicon fixed her right up (to the tune of $45 or so). If I recall correctly, they charge an arm & a leg now that the units are discontinued, but I think they'll sell you just the encoder cheap then you or a trusted local tech can install it. My recommendation is to give Lexicon a call and see what they say. This has been discussed repeatedly in the past on this list, but a search of the archive for "Vortex Rotary Encoder" turned up nothing. Odd. I'm sure others here have more recent dealings with this problem; maybe they'll chime in. Good Luck, Todd