a buddy of mine has a rick and i notice it has tone for both bass and treble, just wondering whats the diff? does treble to the bridge pup and bass the neck or does it alter the freqencies independently as i expect? if so it would be cool to have circuit controls to alter bass and treble tone like that on a passive bass. im always looking to alter my bass for the better trying to get as much versatility as i can get. thx.