It's a Marshall MG10 (just a practice amp). It only has 2 channels, clean and overdrive (this one causing the buzz). When I use overdrive, having my guitar already plugged in, there is a very very annoying electrical buzz. This happens without me touching the strings at all. BUT as soon as I put my hand on the strings and hold them, the buzz stops. Note, that the buzz is there even if the strings have not been plucked.
If I switch channels to clean, hardly any buzz at all!
WTF is causing this???
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