The Drums Production webinar is how I learned to use Audiosnap across multiple tracks for anyone who is interested. They keep it limited to drums and I had to modify the procedure to use it across an entire set of tracks (a whole band) but the methods shown got me going. I insert my own Transient Markers across tracks using Snap to Grip (moving/disabling/deleting any auto detected markers that are in the way) to get the general song tempo in order then switch to the more traditional methods to correct individual timing issues on beats or late/early starts/stops on other instruments. It takes two passes to do this (one for general tempo correction them a second to line the individual parts up).
 
Audiosnap however is very quirky and awkward in X2 doing even simple stuff so doing it across multiple tracks just multiplies the weirdness. You will likely want to make sure your system is set to handle the serious processing loads involved (turn up your buffers). I've been told it is more stable in X3 which would be great. It's a neat tool when it's working properly. When it's not it is fist through monitor infuriating.