need HELP using soundbites to tempo (!)

[rumble]

i've got 2 tracks of live audio (a guitar and bass track)transferred from a zoom r24 recorded at 48khz/24 bit.

unfortunately the guitar intro vamp & bass solo obligato is faster than when the tune actually starts.

i'm trying to add some live percussion parts to it, and i can compensate for the tempos being all over the place, but it sounds too weird when it slows down after the vamping intro.

i'd like to make it all the same tempo, but i can't figure out how to make that happen.

i've tried analyzing beats, analyze soundbite tempo, adjust soundbites to sequence tempo, etc., and it just seems to mess everything up (and i don't know if i've corrupted anything by adjusting beat sensitivities, etc.)

if i analyze soundbite tempo i get a straight tempo line in the waveform editor that says 149.14, but another time i did it i got varying tempos between each consecutive slice.

i tried create soundbites from beats but i can't seem to align all the individual beats (unless i do them all manually which would take forever, and then run the risk of things sounding weird if there's a gap between some beat slices.)

is there a tutorial on this somewhere, or can someone take the time to walk me through this? i can't find much in the forums that applies.

i've have dp 4.6.1 and a g5 dual 233 running tiger.

thanks