Apple Final Cut Pro 7 - Manual (Page 682)

If the clip items you want to make into a stereo pair have different durations, the clip
items are trimmed to the region where they both overlap. The levels, pan settings, and
filters that were applied to the top clip are applied to both, and the clip attributes from
the bottom clip are ignored.
Audio level overlays
(the pink lines) Before Two clips that are not a
stereo pair; length and
audio levels differ.
Stereo pair indicators
Audio level overlay (the
same on both tracks)
Only overlapping parts
of the clips remain, and
the audio level is copied
from the top clip to
the bottom clip. After
To separate a stereo pair
1 Select a stereo clip item.
2 Choose Modify > Stereo Pair, so that there’s no checkmark next to the menu item (or
press Option-L).
Working with Audio at the Subframe Level
While the smallest unit of video is a single frame, the smallest adjustable unit of audio in
Final Cut Pro is 1/100 of a frame. Audio level and pan keyframes, as well as the sync
between the video and audio tracks of a clip, can be set with an accuracy of 1/100 of a
frame.
682 Chapter 43 Audio Editing Basics