I have a passive 5-string Jazz style bass with SD Basslines single coil Jazz p/u. The bass seems much brighter than a vintage jazz bass. I heard changing the pots with different resistance values can give you a different roll off. I want to make mine to have a little more roll off in the highs, but maintain the midrange detail. Also, I want to know what P-style pickup will fit for this and work with the rear single coil J- p/u to make a PJ. When this bass was built for me, I had Michael Dolan route out a cavity to install a P pickup when it was time. Still need a pickguard though. I have seen P pickups for 5-string PJ basses on Fender and Sadowskis. Don't know where to buy or part numbers.