There is a constant hum from my electric guitar whenever I switch to certain patches on my ZOOM 707 II which stops only when I damp all the strings with my palm . Is there anyway to get rid of this? Or is it a problem with the guitar which is a cheap strat copy from J & D (Heard of it?). Also when I play 2 notes one after the other say 12th fret G and then 12th fret B while allowing the G to ring, the 2 notes seem to interfere (only on distortion). Is this normal or again a problem with the guitar? If this is normal how do I damp out the G without affecting the B? If it is just removing the finger from G then it is very different from playing an acoustic guitar (which I am used to playing) where emphasis is on sustaining the notes. Comment… Also how do I get rid of the SQUEAK whenever I shift power chords ?