Apple Final Cut Pro 7 - Manual (Page 421)

2 Scrub through the beginning or end of the clip and find the frame where the clapper on
top of the slate first closes.
3 Set an In point if the “clap” appears at the beginning of your clip, or an Out point if at
the end.
Note: If you decide to use an In point, you should use an In point for each clip you want
to include in the merged clip. If you don’t set an In point yourself, the first frame (Media
Start) of the clip is used instead. If you decide to synchronize by Out points, you should
use an Out point for each clip to be merged. If you don’t set an Out point yourself, the
last frame of the clip is used.
4 Open each audio clip you want to merge in the Viewer, and repeat steps 1 through 3,
identifying instead the frame of audio where you first hear the clap.
Once all your clips are synchronized, you can merge them.
To create a merged clip from two or more clips in the Browser
1 In the Browser, select all the synchronized clips you want to merge.
2 Choose Modify > Merge Clips.
3 In the New Merged Clip dialog that appears, select a method with which to synchronize
the clips: In points, Out points, Timecode, Aux Timecode 1, or Aux Timecode 2.
421 Chapter 29 Merging Clips from Dual System Video and Audio