Apple Final Cut Pro 7 - Manual (Page 563)

If you press the Delete key, only the items on track V1 are deleted.
After deleting; only
the selected region
is deleted.
To turn on or turn off Auto Select on a track
µ
Click the Auto Select control for the track.
Auto Select control
To turn on Auto Select on one track while simultaneously turning off Auto Select on
all other tracks
µ
Option-click the Auto Select control on the track you want single out for Auto Select. (If
Auto Select is off for all tracks, you need to Option-click the control twice.)
563 Chapter 37 Finding and Selecting Content in the Timeline