Very interesting, Noel. I didn’t know this feature existed either. While I haven’t matched vocal tracks to the extent Kenny G has, where I have done it manually*, it’s taken me way longer than he did and without the benefit of stretching.
* i.e. splitting and moving.

As I normally triple track my vocals and BVs to fatten them up (and hide some warts), I can see this being very useful. I might try it out on an existing project.

Good find!
Andrew