Hi all !!! I'm loocking for a new active pickup set up that allow me the widest sound range. I'm Bartolini's oriented, but 2 question: 1) what's the main difference between a soapbar and a humbucker p.u. (exept for the shape, obviously) 2)which Bartolini active bridge and neck p.u. do you raccomend me (W4EX; W4C; others...) [is MME p.u. similar to W4?]? Thanks!