Question regarding audiosnapping drum tracks.

Ive allways ignored audiosnap, but recently i gave it a try on some drum overhead tracks and to my amazement it worked perfectly!
Being able to quantise a live drum track as easily as midi is really going to help me tighten up my self played drum tracks.
 
Im running x3e, for a 4 track drum recording (1 stereo overhead pair, mono kick, and mono snare) what is the process to stretch  quantise the overheads while chopping the kick and snare tracks into snippets that are still phase aligned with the quantised overhead track?
 
From reading the manual i understand its about making the kick and snare tracks use the transient pool from the overhead track, but im not shure of exactly the process.
 
thanks in advance...