Recently I went to a new practice/recording studio, with my newly built Tele/Jazz Partscaster. When doing vocals, I got the much known "little shock" upon touching the mic while singing. Nothing drastic, but still a zap each time my lips touched the mic. Like many threads discussed before, I suspected the Amp, Outlet, or PA mixer not being grounded to the same outlet as the Amp, etc.. However, since this was a new partscaster built, I thought "maybe, the guitar might have something to do with it?" So, I tried with the lead guitarists guitar, and nothing happened. No zap. Which made me curious. -I have a ground wire running from bridge to back of vol pot for grounding. -I did the rest of the session with a foam windscreen, but thats still not comforting me much. -I live in Europe, 220v (so amp prongs are if i am not mistaken, have ground on the plug). What gives?