My PJ bass has volume/volume/tone controls on it, the tone control was getting pretty noisy so I replaced it with another 500k pot and now noise is gone but the bass sounds real muddy. I am pretty good with electronics but not sure what happened here. I have replaced many electronics with out any change in tone. Could I have replaced the pot with another bad one? Any help would be great.... this is my favorite sounding bass in my collection (at least it was) and now it sounds horrible.