| Have the same issue with my sonic stomp, to a lesser degree. On mine it is because the knob is rubbing against the metal body. I was miffed when I got it but kept it and its been a tank.
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2010 Fender Geddy Lee, 2011 Fender Classic 70's Precision, Squier CV 60's P, STM 900, TC RS 210/212.
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