I've had a broken WAH pedal on my shelf for years. Finally probed it and determined the foot switch is the problem. However I'm not sure if the foot switch itself is
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VOX V847 WAH WAH FOOT SWITCH, ECB820 | Parts Is Parts - Guitar Parts, Amplifier Parts, Korg Keyboard Parts
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Talk Wah Pedal, True Bypass Switch Easy To Operate Guitar Wah Effect Curve Metal Shell For Audio Equipments - Walmart.com