5.5

17 Working with Trim Edits
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The Extend button appears in the Trim tab of the Command palette. You can map the
Extend button to a custom location. For information on the Command palette and button
mapping, see “Understanding Button Mapping” on page 113.
The adjustment appears in the Timeline.
After the Extend edit. The edit point on the video track moves backward to the location of the
Mark In point.
Maintaining Sync While Trimming
Because single-roller trims (A-side or B-side) can change the duration of the track being
trimmed, any relationships that exist with other tracks downstream of the trim lose sync.
Trim editing uses two features that prevent unintentional sync breaks between two or more
video and audio tracks when performing trims:
• You can use an overwrite trim to add black filler on either the A-side or the B-side of a
transition while maintaining the overall duration of the track and the sync relationships.
For more information, see “Overwrite Trimming” on page 718.
• You can sync lock tracks that maintain a synchronized relationship.
If you perform an overwrite trim moving across the edit point and away from the
selected side of the transition, your Avid editing application performs a dual roller trim
on sync-locked tracks.
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Because dual-roller trims do not cause sync breaks, you can add black only while
performing single-roller trims, and sync-locked tracks only aid single-roller trim functions.
To trim with sync-locked tracks:
1. Do one of the following:
t Click the Sync Lock button in the Track Selector panel for the track you want to
keep in sync.
The Sync Lock icon appears.
t Click the Sync Lock All button to switch sync lock on and off for all tracks.