I'm planning on building a bass. On the subject of pick-ups, do P-styles, J-styles, soap bars, MM styles, etc. each typically offer different sound quality unique to their design? Or does it all amount to nothing other than real estate and what you want that part of the bass to look like? I'm thinking of making an 8-string bass because I'd also like to be able to restring it with mandolin strings as an experiment. I'm just wondering if pick-ups good for bass would also be good for treble or if I'd have to run a different pick-up.