mini q tron (for repair) electro harmonix q-tron

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mini q tron (for repair) electro harmonix q-tron:
$19.99

Powers on fine, but makes a squealing noise when playing a note. It sounds like a theremin when playing through it which is actually amazingly cool sounding, but it doesnt work as an envelope follower. May require some tweaking to fix. Bypass switch works and knobs function, but only after someone fixes the bad opto circuit. A knob fell off so I found another to replace. Sold as is knowing someone will need to repair it.