Apple iMovie HD - Manual (Page 74)

74 Chapter 9 Working With Sound
Snapping Audio to Video
When snapping is turned on in your movie, you’ll see a yellow snap line (shown in the
illustration above) appear as you reach the end of video and audio clips or come within
3 or more frames of audio silence. When the yellow snap lines of your audio and video
align, you’ll have a very precise fit that would be difficult to achieve without snap lines.
To turn on snapping:
1 Choose iMovie HD > Preferences.
2 Click General and click the “Snap to Items in Timeline” checkbox.