I have an OBP-1 in my Fender Jazz and love it. In another bass I have the EMG BTS preamp with 3 active EMG pups. The contols are: 5 way switch for pup selection (works like a strat), master vol, master bass boost/cut, master treble boost/cut. I've been thinking of replacing the BTS preamp with an OBP-1 (keeping the EMG pups). Will this work? A wiring diagram would be great but I can't find any info on using the OBP-1 with 3 pups anywhere.