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If i switch off my wah and turn the volume and tone controls off on my les paul theres complete silence- good! But if the wah is on and i turn the volume and tone off theres a humming sound. Is that supposed to happen? It annoys me because i use my wah a lot, as a filter too, and when i mute the guitar between songs the wah still makes noise even tho the volume and tone are turned down!