Hi Ryan,
While this is indeed quite cool, it's still not as handy as editing slices IMO - allow me to explain. But first I'll just say that knowing both approaches allows you to choose the one that works best - they both end up with the same result.
The advantages to editing slices:
•You can listen the results as you go by simply hitting play and you'll hear your work at steady tempo, allowing you to correct any mistakes you may have made on the fly.
•You can check your work as you go against your existing REX loops and drum tracks - makes it easy to know how it will sound.
•You can apply these exact same techniques to Note Clips, something I actually just happened to need to to yesterday! Learn one approach and apply it to both situations!
•You don't have to line things up perfectly like with your tempo method, so you can work quickly - just get the slices close and then Quantize away!
•You can continue to tweak the timing/slices after the initial sync work is done, as you don't have to commit your work to a new audio file at any point.
As for your example… you know I love you so I hate to bust your bubble here, but that song
was recorded to a click at 55 BPM - it's just difficult to tell since she plays so freely around the click. The "tell" is that you can set the tempo to 55 BPM and adjust the start time of the original file to bar 1.3.2.70 and the song will stay synced from start to finish - not PERFECTLY synced, but close enough that if you simply import the file to a new session at 55 BPM and apply the offset I specified above, you can then simply hit quantize and end up with what you created with MUCH less work!
In fact, here's a short video I made of me going through those steps, which took about 30 seconds total!
Definitely not up to your video standards, but it's about the data here folks!