I am working on a bass that is routed for a P-bass pickup and a MM pickup. It was originally wired as a passive bass with a separate volume and tone control for each pickup. I am putting in some Seymour Duncan Basslines pickups and adding the 3 band preamp. The simplest setup would be just to follow this wiring diagram (I already have the harness that just needs the pickups connected). This might be a crazy thought, but would it be possible to wire the P-bass pickup as passive and connect only the MM pickup preamp without giving each their own volume control? I figured this way I could get either a passive P-bass sound or an active MM sound. If I can have the two pickups wired differently (one passive and one with active electronics), could the sounds be blended with a blend pot, or would a toggle switch work to select which pickup is in use? I am just curious is this is possible, and if so, how that would be accomplished. Otherwise, I'll just go with the diagram above to connect both pickups to the preamp.