Apple Soundtrack Pro - Manual (Page 176)

176 Chapter 7 Working in the Waveform Editor
Deleting Actions
You can delete an action if you decide you no longer want it in the project.
To delete an action:
m Select the action in the Actions list, then press Delete.
Limitations of Actions That Change the File’s Length
Some actions change the overall length of the audio file by inserting or deleting audio.
These include inserting silence, noise, or a waveform, time stretching, and deleting part
of a file. Recording audio, pasting, and adding an effect with a “tail” can also change the
file’s length. In the Actions list, the selection checkbox for each action that changes the
file’s length appears red, making it easy to visually distinguish those actions.
Each selection you make in the Waveform Editor applies to a specific range of time, and
each action applies to a range of time defined by the selection at the time the action is
applied. Because selections and actions apply to a range of time, changing the file’s
length can change the audio to which a selection or action applies. In the Waveform
Editor, you see the selection remain in the same place (the same range of time as
shown in the Time ruler) and see the waveform under the selection change.
When you apply an action that changes the file’s length, any existing selections apply
to the same range of time, but the audio occupying that range of time may be different
than when you applied the action. For example, if you select a range of time beginning
five seconds after the start of an audio file, then insert one second of silence at the
beginning of the file, the selection still begins five seconds after the start of the file, but
the audio at the beginning of the selection corresponds to what was previously four
seconds after the start of the file.
If a project includes an action that increases the file’s length, and you turn off or reorder
that action, any selection that includes audio added by the length-changing action may
extend past the end of the shortened file. In this case, the selection applies to the
remaining audio in the selected range of time, but has no effect past the end of the file.
For example, if you have a five-second project that includes a one-second Insert Silence
action at the beginning of the project, and you select the last half-second of the project,
then turn off the Insert Silence action, the selection applies to the last half-second of
the project. However, the remaining half-second of the selection is empty.