hey guys, I'm been playing the same Yamaha bass for about 2 years now, and recently it's been making a lot of buzz whenever i'm playing open notes, not touching the strings. I took it apart, and to my surprise, when I hold onto any of the knobs (Volume, High/low, tone) without there covers on them, it doesn't buzz at all, do you guys think i'm missing a ground wire or something? I really don't know what it could be, I've never been good with wiring. But if you guys could help me, that would be great. 
