hi! i have a Mexican Fender Jazz Bass(maple fretboard) and i'm not very happy with its natural sound. i wanna change the pickups and the pre amp. i would be really grateful if you guys could help me attain a round and low heavy tone as the maple fretboard takes care of the highs(especially when i play harder) . this bass is mostly for live gigs and i play in a rock band that needs a solid low end holding the groove. thanks a ton guys!