Hi all, First, a search did not get what I needed. So here is my problem: while working on a friend's bass, I was taking it for a spin and discovered that the tone knob cuts volume on both pickups. not completely, but very close to it. So tone knob wide open = full volume. When tone knob is rolled off the volume goes way down. To almost nothing when tone knob is turned all the way down. A cursory exam under the hood revealed nothing to my non-expert eyes. This is a late 90's Fender USA 5-string Jazz bass, with no apparent mods to the electronics that I can tell. I can take pics if necessary, but wondering if there is a quick explanation that someone might have. Volume pots for both pups work fine. jack has a little crackle to it when the cable is moved around. Thanks guys!