Looping Track Playback
To toggle looping of tracks:
1From the Play pop-up menu, choose which tracks you want to loop:
Entire audio file
All active tracks
All tracks (whether active or inactive)
The name of a specific track
2 Choose Controls > Loop Playback.
When you play the audio file or tracks you selected, they will loop.

See Also:

Hiding or Showing Tracks for Editing
Playing Individual Tracks
Playing the Entire Audio File
Playing All Active Tracks