Apple Soundtrack Pro - Manual (Page 114)

114 Chapter 5 Working in the Timeline
To split audio clips with the playhead:
1 Set the playhead at the point where you want to split the clip, then select the clip or
clips you want to split.
You can split multiple clips in the same operation.
2 Choose Edit > Split (or press S).
Every selected clip under the playhead is split into two segments. The first segment
ends at the playhead position, and the second segment begins at the playhead
position.
You can join clips from the same original audio file, including segments of split clips.
Clips being joined must be adjacent to each other and in the same track.
To join audio clips:
1 Place the clips next to each other in the same track.
2 Select the clips, then choose Edit > Join (or press J).
When you join looping files or segments of looping files, the joined file plays to the end
of the source audio file before looping. The notches in the joined file indicate the end
of the source audio file.
Move the playhead to
where you want to split
the selected clip.
The clip is split into
two segments, each of
which plays part of the
source audio file.