At least I'm pretty sure it's unusual. I've got a pretty decent understanding of grounding and shielding. However, I've been having an issue with the simplest of Precision bass circuitry that it's sort of making me question what I know. Bass is wired pickup to straight to the jack. Bridge ground and cavity shielding also to the ground prong on the jack. No controls. Anyway, I understand that: (1) if when you touch metal on your bass and the buzz gets louder, it's a grounding issue (2) if when you touch metal on your bass and the buzz goes away, it's a shielding issue To start off, there is a VERY VERY slight buzz when the bass is plugged in and I'm not touching anything; hands up in the air. It's almost inaudible unless the amp is turned up really loud, then you can hear it, but again very quietly. This doesn't bother me and seems relatively normal when playing a bass in an old house with a bunch of other apartments that have computers, light bulbs, TVs, cellphones, etc. My confusion comes from the following: -When I touch the bridge or the washer on the input jack and nothing else, the VERY VERY slight buzz gets goes away. Okay, normally I'd say that's a shielding-related thing. BUUUT... -When I touch the mounting screws or pole pieces of my bass's standard split-coil precision pickup and nothing else, there is a loud grounding-related buzz. (This was also going on when I first put the bass together, with the original SX pickup, before I shielded the cavity and before performing any pickup swaps.) I've never had both of these things happen before at the same time... The wiring on this bass is as simple as it gets. Also, i've tried three separate P bass pickups (stock SX and two different American Standard P bass pickups) and tried each of them through both of my amps and in different houses. The same problems were still occurring. So I'm stumped! What could possibly be causing this? Is my bass possessed? Any help would be greatly appreciated!