Apple Soundtrack Pro 2 - Manual (Page 194)

194 Chapter 6 Editing Audio Files
You can view and modify a clip’s media file in the File Editor tab without losing the
context of your multitrack Timeline. This is called editing in place. Simply select a clip in
the Timeline and it appears in the File Editor tab below. The playheads in the Timeline
and the File Editor tab are synchronized so you can play the media file within the
context of your whole multitrack project. Any changes you make to the media file are
updated in the Timeline immediately.
If you prefer, you can also double-click a clip in your multitrack project and its media
file opens in a new File Editor project view, ready for waveform editing. Changes you
make to the file are instantly reflected in the multitrack project.