Apple Soundtrack Pro - Manual (Page 230)

230 Chapter 10 Working With Automation
To select a Timeslice from multiple tracks:
1 Click in the selection bar of the topmost track you want to include in the Timeslice, at
one end of the area you want to select.
2 Shift-click in the selection bar of the bottom track you want to include in the Timeslice
at the opposite end of the area you want to select, or Command-click in nonadjacent
tracks to add those tracks to the Timeslice.
You can select a master Timeslice that includes the audio content and the envelopes of
all tracks, including the video’s audio track.
Click in the selection bar of
the topmost track you want
to include in the Timeslice.
Shift-click in the selection bar
of the bottom track you want
to include in the Timeslice.