Curious about slip edit when changing tempos

By default, audio clip start times use the "Musical' timebase so they'll remain aligned to M:B:T timeline when the tempo is changed, and it's not necessary to have them start at time zero to keep multiple tracks/clips in sync. Craig's suggested procedure might require that because he's using Fit to Time, but I'm not sure why he chose that method for changing to a known target tempo.
 
If your project has a single fixed tempo to which the tracks are already currently aligned and you know the target tempo, try this instead:
 
1. Select all audio tracks.
2. Open the Audiosnap palette and click the "Power" (enable) button.
3. Change the tempo in the transport module.
4. If you intend the change to be permanent, use Bounce to Clips(s) with the content-appropriate algorithm selected for each track in the Audiosnap options to render the stretching using higher quality "offline" algorithms.

Sorry, I just wrote that off the top of my head, and did not double-check that AS would enable on all selected clips in one go, but I think it should.
 
Also, I left out a key step! Enable Clip Follows Project in Autostretch mode (select from the drop-down to the right of the button).
 
The detected clip tempos don't matter in this case. AS is just going to stretch all clips evenly by a percentage based on the ratio of the new tempo to the old one without regard to transient locations.