Apple Final Cut Express 4 - Manual (Page 435)

Chapter 30 Linking and Editing Video and Audio in Sync 435
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3 Choose Modify > Link (or press Command-L).
Note: When you open linked items in the Viewer, each linked mono audio clip item or
stereo pair of clip items appears in an Audio tab in the Viewer.
Unlinking Video and Audio Clip Items
When you don’t want audio and video clip items to be linked in the Timeline, you can
unlink them.
To break the link between clip items:
1 Select one or more linked items in the Timeline.
2 Choose Modify > Link (or press Command-L).
Names of linked clip
items are underlined in
the Timeline.