Hi guys, I have a problem. I bought a prewired jazz bass varitone control plate from ebay for around $120 over 2 years ago. mine has the 3 knobs and 2 switches, one of the knobs is a 6 way switch. Im not sure exactly what each switch does because I lost the paperwork. The problem is that I fitted it and now i am getting some serious buzzing when i touch the knobs. the pickups are not original and the bass had no buzzing at all before the switch. I am tempted to go back to the way it was before but I modified a custom carbon fibre pic guard to fit this setup. Any ideas as to what could be wrong would be appreciated. Thankyou.