I have had a boss ME-50 for a while and it makes this really annoying humming noise. Basically there is no way that my amp can be perfectly quiet, even if my guitar isn't making a sound. I thought it was my guitar but when I plugged in my guitar straight to the amp the humming noise stopped. Does anybody know what is causing this?
I have had trouble with my ME-50 humming when I was using cheap AC adapters or the Boss daisy chain power supply. It doesn't hum when using a quality adapter and not with my Voodoo lab power supply either. Don't know if that helps but look into it, it might just be an issue of not being properly grounded.