I acquired a passive affinity jazz bass v/v/t 3 Nob cheap $50.. I like the neck and the sound but my issue is: I get no sound from the neck or bridge pups until they are on full.. Can this be fixed by upgrading the pots?? Capacitor?? Any info would be great thanks... I plan to install new pups maybe even a pre, but I do like the tone this bass has as is.. I'd like to fix this issue and then maybe look into other options..