Hey, all. I'm hoping I can get a little help with a new-to-me G&L Tribute L-2500 I picked up off Craigslist Wednesday. Assuming the controls match the ones described on the wiring controls diagram here, then when I switch to the bridge pickup (top switch back position), the treble (middle) control knob functions as a volume control, with the bass producing no sound at all with the knob rolled all the way off. It does this whether it's in active, passive, or active with treble boost mode. Is this normal behavior for this bass? A known mod? Or is something just wonky?