Apple Motion 4 - Manual (Page 357)

Locking Timeline Tracks
Occasionally, you may want to prevent changes to a particular item. The lock icon at the
right edge of the Timeline layers list allows you to lock an object and prevent any changes
from affecting that object. An object that is locked in the Timeline also appears locked
in the Layers tab in the Project pane.
Lock icon
Tracks appear locked in
the Timeline.
When an item is locked, the bounding box in the Canvas turns from white to red and the
colored bar appears with a cross-hatched pattern.
Locked tracks still appear in the Canvas and are included in your final output. Although
you cannot make changes to a locked object, you can still copy or duplicate that object
or change the object’s layer order.
To lock a track
µ
Click the lock icon at the right edge of the Timeline layers list.
Audio-Video Links
Ordinarily, objects that contain both audio and video are linked together so that they
always remain in sync. This link is represented by an icon in the Timeline layers list.
Note: To display audio in the Timeline, click the Show Audio button, located in the
lower-left corner of the Timeline tab.
Objects that are linked are always edited together in the Timeline. Operations such as
cut, copy, paste, and split also affect both audio and video. However, if you ever want to
break that relationship so that you can move or edit the audio or video without the other
tagging along, you can disable that link and move either object freely. Beware that this
may result in your audio and video playing out of sync.
To manipulate audio and video elements separately
1 Click the link icon to the right of the object name for either the video or audio element.
357 Chapter 8 Using the Timeline