Hi, I just installed a Seymour Duncan Custom Shop Stack for Single Coil P-Bass in my Fender 51 Reissue P-Bass. I also faithfully followed the wiring schematics provided with the pickup. My problem: Now the tone knob seems to behave quite strange, since turning it down, doesn't only reduce treble but also a significant amount of volume. Any idea what might have happened here. Maybe something wrong with the capacitor due to soldering? Help very highly appreciated.