Apple Final Cut Pro 7 - Manual (Page 717)

Controls That Affect Trim Edits
Before you perform a trimming operation, make sure to check that the following controls
are set properly for the operation you need to perform.
Linked Selection
Clip items that refer to the same media file are linked together when you edit them into
the Timeline. You can also link unrelated clip items together so you can operate on them
simultaneously, keeping them in sync.
For your convenience, you can keep linked selection turned on and temporarily disable
it as necessary. You can temporarily disable linked selection by holding down the Option
key while selecting or trimming a clip item in the Timeline. This allows you to adjust one
clip item at a time, even if it is linked to others. This is a good way to create split edits,
where the audio In or Out point is different from that of the video.
Click here to turn linked
selection on and off.
Snapping
If snapping is on, when you drag an edit point in the Timeline or Viewer, it snaps to In or
Out points, markers, keyframes, the playhead, and edits on other tracks. This can help
you quickly line up edits with other items in the sequence. You can turn snapping on
and off at any time, even in the middle of dragging edits and clips. You turn snapping
on and off by choosing View > Snapping, pressing the N key, or clicking the Snapping
button in the Timeline. For more information, see
“Snapping to Points in the Timeline.”
Click here to turn
snapping on and off.
Locked Tracks
Trim operations with the Ripple tool will only affect clip items on unlocked tracks. If there
are clip items on certain tracks you don’t want to change inadvertently while trimming,
you can lock these tracks in your sequence to prevent unwanted changes.
717 Chapter 45 Learning About Trimming Clips