Apple Soundtrack Pro 3 - Manual (Page 197)

To select a portion of a clip with the Timeslice tool
1 Click the Timeslice tool at the top of the Timeline (or press W).
2 Drag across any portion of the clip with the Timeslice tool.
A Timeslice selection rectangle appears over the portion of the clip and the File Editor
tab displays the same selection in its waveform view.
Timeslice selection
File Editor selection
To adjust the size of a Timeslice selection
Do one of the following:
µ
Drag any of the four edges of the selection to extend or shorten that side of the selection
rectangle.
µ
Shift-click any track you want to include in the Timeslice at the opposite end of the area
you want to select.
197 Chapter 7 Editing Audio in the Multitrack Timeline