These are real nice tone controls. I've used them on my Legacy since 1995. The circuit is pretty simple with the addition of a couple of caps on the tone pots which are different than standard Strat pots. For those who haven't used them, the volume control is a standard control. No difference there. The middle tone control is a pretty standard treble roll off control & the bottom tone control is a bass rolloff. I like using the treble roll off to thin out the middle pickup or the bridge and middle together. The circuit is without a doubt more versatile than the standard Strat wiring. It makes me wonder why no other guitar maker I know of uses this type of circuit.