Apple Soundtrack Pro 3 - Manual (Page 187)

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Control-click the clip in the Timeline, then choose Enable Clip from the shortcut menu.
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Select the clip. In the Details tab, select the Enable checkbox.
Locking and Unlocking Clips and Tracks
You can prevent any changes to a clip or a track by locking it.
Locking Clips
A locked clip cannot be moved, resized, or otherwise modified in the Timeline. A locked
clip can be enabled or disabled. A clip can overlap a locked clip. The envelope points
under a locked clip are locked based on the envelope mode: if attached to a clip, envelope
points are locked; if not attached to a clip, envelope points are unlocked. For more
information about attaching envelope points, see
Adding Envelope Points .
To lock a clip in the Timeline
Do one of the following:
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Select the clip, then choose Clip > Lock Clip.
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Control-click the clip in the Timeline, then choose Lock Clip from the shortcut menu.
Choose Lock Clip from
the shortcut menu.
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Select the clip. In the Details tab, select the Locked checkbox.
To unlock a clip in the Timeline
Do one of the following:
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Select the clip, then choose Clip > Unlock Clip.
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Control-click the clip in the Timeline, then choose Unlock Clip from the shortcut menu.
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Select the clip. In the Details tab, select the Locked checkbox.
187 Chapter 6 Working in the Timeline