Hi all. I demoed a new Stingray 5 in a store today with the 3 band and single pickup with a 3 way switch. While I absolutely LOVED that bass the thing had a fairly significant hum with the switch in the middle position. Like a jazz bass hum but worse. It would increase if I boosted the pre amp settings. Switched to the front or rear and it was silent. Is this normal? Also how does this sound differ to the 2 band? I hear a lot of people like those.