Apple Soundtrack Pro 3 - Manual (Page 188)

Locking Tracks
When an audio track is locked, the clips on the track cannot be moved, resized, or
otherwise modified in the Timeline. Clips and effects cannot be added to or removed
from a locked track. Effects and other parameters (such as pan, gain, and output) are not
editable on a locked track.
To lock a track
Do one of the following:
µ
Select the track, then choose Multitrack > Lock Selected Track (or press F5).
µ
Control-click the track, then choose Lock Selected Track from the shortcut menu.
Choose Lock Selected
Track from the
shortcut menu.
To unlock a locked track
Do one of the following:
µ
Select the locked track, then choose Multitrack > Unlock Selected Track (or press F5).
µ
Control-click the locked track, then choose Unlock Selected Track from the shortcut menu.
188 Chapter 6 Working in the Timeline