It can be helpful to pull the audio out of a video clip to edit it separately, or to use it as background audio for a different video clip. (iMovie HD can technically overlap audio clips, but it crams them all onto the two tracks, making them hard to manage-and you can still only work with two tracks at a time.) Extract audio clips In iMovie ’08, however, you can keep adding audio to the filmstrip to create as many overlapping audio tracks as you can tolerate before your ears start to ring. If you were working in iMovie HD 6, those would be the only two audio tracks you could effectively work with. Background Music: When you drag a song file to the Project Browser but don’t drop it directly onto the filmstrip, it appears as a green box behind the entire filmstrip, serving as background music. If, however, you drag an audio file and drop it onto a portion of the filmstrip, the audio appears as a green horizontal bar below the video and remains locked to that footage as you edit. When you play the movie, the music plays in the background, unanchored to any particular bit of the video footage (see “Background Music”). When you drag a song from the Music And Sound Effects Browser (press Command-1 or click on the musical-note icon in the middle right to view it) to an area of the Project Browser other than the filmstrip itself, the song appears as a green box behind the video. Somewhat confusing, though, is the distinction that iMovie makes between background music and other audio.
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