Can you help me trouble shoot hum on a bass? Prefer responders to be electronics knowledgeable, not guessers. Bass has 2V, 2T controls, with 2 humbuckers. Scenarios: 1. v2=max t2=max v1=max t1=max -> Loud Buzzing. 2. v2=max t2=min v1=max t1=max -> Super Quiet 3. v2=max t2=max v1=max t1=min -> Super Quiet 4. v2=50% t2=anything v1=50% t1=anything -> Low buzz ? Help greatly appreciated.