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Positive ground fx power supply buzzing?


Hi dudes, sorry if this has been covered before...

Could anyone tell me... When you have your amp switched on, and you have a positive ground pedal powered up to a mains/9v power supply, with a guitar plugged into the amp, but with NOTHING plugged into the pedal... when you touch that pedal do you get a loud buzzing noise through the amp? ...and if so, why/how does this happen if its ONLY connected to the power supply and nothing else?!

Thanks :)
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