Ahoy. I've had a homemade Music Man HH project in the works for a while. I had a preamp on order, but it's looking like I won't be getting it, so I'm resorting to piece together my own from another preamp and a rotary switch. The whole shebang has to fit in the routing cavity of your average top-routed Precision bass with a separate battery compartment, so I'm looking at a 2-band preamp with a 5-way rotary switch to get the coil selection of a Music Man HH. Problem I have is that I have no idea how to A: Wire the pickups to the switch to get the coil selections, and B: insert it into an already wired preamp to not screw everything up. Any help with this would be appreciated. Thanks.