I have a set of old, original DiMarzios in my 70's Jazz bass. They have four wires on each, but only two are used in the standard installation. I installed them myself according to the instructions that were included. The instructions mentioned possible wiring options for the other wires, but didn't give any specific diagram to do anything but the standard installation. Since I did the modification 20 years ago, I don't really remember what the other wires do. Has anyone wired these pickups with alternate configurations? If so, please describe how the bass sounds with the alternate wiring. Are other switches involved?