So at practice a few weeks ago (at a new space) my Jaguar bass had a crazy hum that increased when I touched the strings, but decreased when I touched the metal pickup plate. I tried it on another amp and the humming was still there. So, I took it in to get looked at and the repair guy said that everything sounded fine and that he could see nothing wrong with it, so he didn't charge me anything and there was no hum at the next practice or gig. Tonight, I put on new strings and hooked up my new pedal (micropog) and into a 4 track and noticed the same hum as before. It increased when I touched the strings, decreased when I touched the input plate, and also decreased when my foot touched the micropog (which has a metal case). Should I get a second opinion on my bass? The repair guy said that he could rip it open and check every single ground, but he didn't want to unless it was for sure giving him problems, so I think I might have to do that. Are they any suggestions/similar experiences? Thanks.