Rather than continue to hijack that poor guy's thread about drop-in preamps, I thought I'd start a new one for a problem I've run across. Okay, I ordered both an Audere drop-in preamp and Dimarzio Ultra Jazz pickups. Both came, and I put them in. Much struggle, much big fight, much pain in the butt, but I finally got all the wiring and battery and everything to fit in the control cavity of my GL J-Bass. Plugged it in, and it works! In fact, it sounds great. One problem: there's a small, but noticable buzzing/humming sound. One that goes away when I touch the knobs or control plate or metal parts of the cable going to the amp. What would be the cause of that? Grounding? It doesn't seem like it'd be a shielding problem (why would it go away when I touch the knobs if it's interference from the electrical wiring in the walls, for example). What do you guys think?