Reply to Warping with S4

I have been working a little with older tracks with a live drummer using Eans method (from Blog article/video) by just picking a spot or 2 where the drummer is tight, setting another grid marker for a second spot, and using those points only.
Now with the S4 you can warp a larger portion of the song by using the sample decks.

Here's what I did.......
Put the song in deck a and b
At the first beat, place a grid marker, then select and activate a 32 bar loop from that marker.
Go to the end of the loop and see if the loop out point is in the proper place. If not, adjust the grid untill the beat marker lines up with were the loop end point should be. Go back to grid marker and re-select/activate loop again so the loop out point moves to the beat marker. Check to see how well the beats and markers line up and the loop end point. If everything looks good then copy to the first sample slot. If it doesn't line up, then shorten the loop to 16 bars and use the same process. Or 8 bars if 16 doesn't work.
Turn off snap. Place a new grid marker on the loop out point of the loop you just saved to the sample deck. You may have to use the jog wheel, or select vinyl for mouse control in preferences, so you can place grid markers that are not on a beat marker. Repeat the above process 3 more times filling the sample slots in order, then move over to deck b (the last grid marker will be there, but you will have to go to it and make a loop the same size as on deck A to get to your loop out point)and do the same thing till you are out of sample slots.
Change hardware deck focus to C and D. Make sure neither is playing and all samples are at start and ready to play. Hit record and play the loops in order muting one as you start the next.

I was able to warp 1min 40sec of a song and the grid was perfect.

That being said the song I used (David Bowie's Rebel Rebel) didn't drift really bad within sections of 16 bars and sometimes 32 bars.
A couple of other notes, I did use Traktors internal clock, but set it to the song's tempo. After getting my loops I recorded on the first take, and it was fine, but when I tried to make a second recording, all the loops didn't jive perfectly. I thought it was my timing, but I tried a few more times with no luck. I guess after the sample plays once, Traktor moves the start point slightly for syncing. Not sure as I need to try this a few more times with different songs. Not sure if it makes a difference, but I also made all the loops with out the track playing.
I'm sure Ableton is much better at this, but for those of us who don't have it, I'm tickled to have found what seems like a useable option. I also want to try finishing the song by making more recordings,and sync the recordings to have the full song warped.