Classroom in a book

4
Switch the Toggle Sync Lock icon (
) off 
on the Video 4 track. Notice that by default 
all tracks have Toggle Sync Lock enabled.
5
Right-click (Windows) or control-click (Mac 
OS) the gap between clips on the Video 1 
track, and choose Ripple Delete. All tracks 
stay in sync except the Video 4 track. This is 
because you turned Toggle Sync Lock off on this track.
6
Press Ctrl+Z (Windows) or Command+Z (Mac OS) to undo the ripple delete.
7
Select the Ripple Edit tool, grab the right edge of the first clip in the Video 1 
track, and drag it an inch or so to the left. All tracks ripple except the clips in 
the Video 4 track.
8
Grab the right edge of the first clip in the Video 4 track, and drag it to the left. 
Notice that the clips are still editable in this track. Turning Toggle Sync Lock off 
does not prevent the clips in the track from being edited or deleted.
Using Track Lock
Now let’s try editing with the Track Lock feature:
1
Press Ctrl+Z (Windows) or Command+Z (Mac OS) a few times until the project 
is back to the start point.

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ADOBE PREMIERE PRO CS5 CLASSROOM IN A BOOK
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2
Make sure all tracks have Toggle Sync Lock on.
3
Click the Track Lock icon (
) in the Video 
4 track. Diagonal lines appear through the 
track header.
4
Try doing a ripple delete as you did earlier, 
and notice the locked track is unaffected.
5
Try to edit or move clips in the Video 4 
track. Notice that you cannot do anything 
to the clips in the Video 4 track.
Finding gaps in the timeline
Adobe Premiere Pro tools make it easy to keep unwanted gaps out of your Timeline 
by snapping clips to one another and other objects such as the current-time indica-
tor. But sometimes an unwanted gap in the Timeline will appear. If the gaps are 
large, they are easy to find. But if the gaps are very small, you might miss them. 
Adobe Premiere Pro has a tool to help you find gaps in your Timeline.