yep. i usually record the hook once. how ever many tracks that takes (2, 4? main, adlibs, doubles, etc) and then find out EXACTLY where it is in association with the beat. ex: zoom in and find out that it's 0:00.04 to the left of a kick drum. then i'll line it up 0:00.04 to the left of the kick drum after the 2nd verse, etc. then, since i made sure all parts of the hook were started at the same recording point, i just line them all up and i'm done. takes me 10 minutes max, i've done it so much.