I'm going to to be getting a Yamaha P bass with a sawn off body later in the week, from the want ads dirt cheap as a "silent practice bass". I've got pickups laying around if the installed one is a dummy. In theory I can simply wire on a 250K(?) linear taper(?) pot and run it to a jack... Do I need/want a cap? Do I even need a pot? Can I output "full roar"? Am I overlooking something obvious? Bridge ground wire?