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You're probably picking up weird radio signals...even on low gain and low powered amps it's still possible to do that if the signal from the station is strong enough.
I used to pick up weird Christian Coalition-style talk radio...and that signal was strong...I could pick it up by merely turning my amp on and touching a cord to anything that conducted electricity (myself included). It made playing guitar a pain in the ass. Yet oddly enough, I moved my amp to the other side of the room and I couldn't pick it up at all.
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