User Guide

Chapter 4: Video Clips 69
Locking the Title Overlay track prevents an overlay’s
duration from being changed even when you trim audio
and video clips at the same time index.
When the track is unlocked, trimming the video clip
above it automatically trims the overlay or title.
Insert Editing
In ordinary Timeline editing, a video clip and the
original audio that was captured with it are treated as a
unit. Their special relationship is symbolised in the
Movie Window by the dotted line connecting the Video
track indicator with the Main Audio track indicator,
showing that the latter is dependent on the former.
The track lock buttons make it possible to deal with the
two tracks independently for operations like insert
editing, which typically means replacing part of a clip
on the video track while the audio track continues
uninterrupted.
For instance, in a sequence that shows a close-up of
someone recounting a story, you might wish to insert a
shot of an audience member smiling (or sleeping!)
without breaking away from the main audio.