I have Cry Baby from the late 70's, circuit photo below, Model# 95-910511. Has been working fine over the decades but gets minimal use. I let it sit in the closet for a couple years and just pulled it out. It's throwing oscillation and massive amounts of noise when switched on. If I have it all the way back the tone is as expected (dull wah), but advancing the pedal to any forward point at all results in nasty noises. It doesn't have to be moving - just adjusting the pedal forward a smidge gets the noise. It's not the basic pedal wiring... the sound is fine with the wah section switched off. I unscrewed the circuit board and looked over the bottom side. There are no obvious bad or degraded solder joints (but I didn't reflow anything). Where should I start checking?