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Volume Knob Related Buzz

I have a strange one... I get a buzz sound that goes away if I touch the input jack. It will also go away if I turn my volume knob all the way up. But in any other position of the knob it will buzz. If I use my wireless setup I have no buzz.

I have tried different cables. I plugged my guitar into the bass amp and had no hum so I don't think its related to the amp. I plugged my bass into my guitar amp and still got a buzz which further leads me to believe that it is related to the bass. All this testing was done in the same room so the house wiring would have been constant.

I pulled the back cover and input jack and all the wiring *looked* ok to me but I'm no electrician. Any help would be appreciated...

Ibanez TR-50
Peavey Firebass 700
 

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