I have a Fender P bass with USA rosewood neck, Bartolini P pups with a Fender USA noiseless J pup added. Two volume pots and a tone pot. I have a couple of issues I will have to correct. First, the volume pots are at low volume until they are on 8 or 9. This is a Franken-bass so maybe it has linear pots rather than audio taper. I haven't checked yet but any idea of what the problem or the fix could be? Second, the J pup is not as strong as the P-pups. Again, any ideas? Also, I'm considering going to a blend pot and two tone pots, maybe. I like p-bass sound over the J-bass most of the time and I haven't found a better sound mixing the J with the P. Comments please? Thanks.