Playing All Tracks
You can play all tracks, including playback of tracks that are hidden. Only tracks will be played, and not any other part of the waveform.
To play all active tracks:
1From the Play pop-up menu, choose All Active Tracks.
2 Click the Play Track button.

See Also:

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