[DiAngelo]

There are times when I want to have an "old" version of a track in one playlist, and the "new" one on another playlist on the same track, and toggle to one or another during playback quickly, without having to click-select-click on the playlist arrow with the mouse.

What's the keyboard shortcut assigned to scroll through playlists on a given track?

A lot of people in Pro Tools class at Pasadena City College (where I'm TA) have been wanting to know this (including the teacher!)