OK, nothing so technical as tone. It's about the wiring. I got the APJ-1 (Pro-Active) BassLines. In the box came FOUR pots. (Can't find a cap though.) This is good because my bass (Ibanez GRB200) has four pots. But the wiring diagrams (that came with the pickup and also online) show only THREE pots. What gives? Any suggestions what to do?