Apple iMovie HD - Manual (Page 68)

68 Chapter 9 Working With Sound
Working With Audio Clips
Audio files, which are in MP3, WAV, or AIFF format, appear as audio clips in either of the
two audio tracks in the timeline viewer, shown in the following illustration. Your video
also contains an audio track that you can extract from video clips and edit like other
audio clips.
Extracted audio is placed in the first track and imported audio is placed in the second
track. You can add more audio clips to any part of your movie by overlapping clips in
the audio tracks. You can also drag audio clips from one track to another and reposition
them to synchronize audio with your video.
Positioning and Trimming an Audio Clip
Dragging from the center of an audio clip moves the clip to a different location in your
movie. Leave a gap if you want silence. If you move an audio clip over another audio
clip in the same track, the clips overlap and you hear both clips at the same time.
You trim audio clips using the direct trimming technique. Dragging from the end of an
audio clip toward the center of the audio clip shortens the audio clip. The trimmed
audio is still present, but it isn’t displayed and you won’t hear it in your movie. Full clips
have rounded corners. Trimmed clips have straight edges where they’ve been
shortened.
To extend the audio clip back to its original size (or close to the original size), you can
drag the end you want to extend.
You can also split an audio clip.
To split an audio clip:
1 Select the audio clip and drag the playhead to where you want the music to end.
2 Choose Edit > Split Selected Audio Clip at Playhead.
3 Select the unwanted portion of the audio clip and press the Delete key.
Imported music Extracted audio
Drag pointer