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.