I'm not very familiar with electronics and stuff so here we go... Could you put a J-Retro Preamp in an MM/J bass with a coil splitter? Would it sacrifice anything and still be good for playing with the back pickup only? Why do J-Retros sound better than most other pre-amps? How do companies make preamps sound better? If you could get a J-Retro in an MM/J, could you get a coil splitter option with it?