Apple Soundtrack Pro 3 - Manual (Page 165)

The In point of every selected clip under the playhead is moved to the position of the
playhead.
To trim the Out point of selected audio clips to the playhead
1 Set the playhead at the point where you want the clip to end, then select the clip or clips
you want to trim.
You can trim multiple clips in the same operation.
2 Choose Clip > Trim Out Point to Playhead (or press G).
The Out point of every selected clip under the playhead is moved to the position of the
playhead.
To trim the In point of audio clips on selected tracks
1 Set the playhead at the point where you want the clip or clips to begin.
2 Select the track or tracks containing the clip or clips you want to trim.
3 Choose Clip > Trim In Point to Playhead (or press D).
The In point of every clip under the playhead on the selected tracks is moved to the
position of the playhead.
Note: Any clip selections supersede track selections; if both clips and tracks are selected
under the playhead, Soundtrack Pro splits only the clips.
165 Chapter 6 Working in the Timeline