I started playing Bass guitar 8-2008. I tried an Ibanez (Active pick up) bass and also a Fender Jazz bass. I am just starting out and not sure of what I'm doing, but I'm noticing a buzz/ distoration at higher volumes on the bass or the Amp. When I'm touching anything metal on the bass guitar (strings, jack input, volume controls) the distoration/ buzz stops. I have made sure the ground is good, wired a direct outlet and circuit for the Amp. The buzz/ distoration doesn't seem to occur every where I go, I tried at the store where I purchased it at and nothing seemed wrong. Could it have anything to do with humidity, moisture, or dryness in the room I'm playing at home? Any suggestions?? It's fustrating because I hear it at home but not when I bring it in for repair or to have it checked.