I'm thinking about installing a Bart NTMB preamp in my bass and want to skip the volume. I have four holes and want bass, mids, treble, and blend. I never touch my volume control anyway, so why have one? I'd be using an NTMB that comes without pots and using my own pots. How can I wire it without the volume? What do I do with the wires that are supposed to go to the volume control?