I just built a Warmoth parts bass, that can be seen in another forum, and would like to do something a little different for the wiring. The bass has 2 soapbar pickups, with hot, ground, and a shield ground, and an OBP-1 preamp. What I'd like to have for controls is: 1 Volume with push/pull for series/parallel 1 Passive Tone with push/pull for normal/slight decrease in neck pickup volume 1 Treble Tone for the OBP-1 1 Bass Tone for the OBP-1 I found a diagram for the passive tone roll-off on Aguilar's website, but I'm not sure how to do the push/pull to decrease the neck pickup volume. I got the idea from a Roscoe Beck I used to have. I know there's a resistor in there somewhere but have yet to figure out where.