Arranging : Arranging Clips : Sync Points

Sync Points
For more information, see the following topics:
The placement of clips in Grid and Spot mode can be based on the definition of a clip sync point. Sync points can be added to audio, MIDI, and video clips and also to clip groups. Sync points are used when a specific point within a clip must be aligned to the Grid or to a particular SMPTE or bar/beat location. This capability is especially important when placing music and sound effects for film and video work.
For example, suppose you had an audio clip for a door slam that included the creak of the door closing, the actual slam, and the reverb of the slam. Using a sync point for the slam sound in the clip lets you spot it to a specific time in the session.
To define a clip sync point:
1 Enable Slip mode (see Edit Modes).
2 Do one of the following:
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With the Selector tool, click at the point in the clip where you want the sync point.
– or – 
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3 Choose Clip > Identify Sync Point. A small down arrow appears at the bottom of the clip, with a vertical, light gray line indicating the location of the sync point.
 
To change the location of a sync point:
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With the Selector tool, click at a point in a clip and choose Clip > Identify Sync Point. The new location is identified as the sync point for the clip.