My Spider 2 amp plays just fine until I move the Gain knob or Mid knob just a hair and this strange super distorted noise blends in with my playing sound. It sounds like the setting "Insane" but muddy, with a crackling noise in it....and when I barely touch my strings it issues a final crackle and mutes all sound exactly characteristic of a noise-gate, or something you would expect from a short in the cable or guitar input jack. I have checked my input, pickups, wiring and bought a new cable too, and found no problems. It can be heard if I barely vibrate my strings, in which case it will permeate through my