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To edit, add, or remove keyframes for animated Level and Pan settings, use the Audio
Timeline or Keyframe Editor. For more information on working with the Keyframe Editor,
see Keyframes and Curves. For more information on editing keyframes in the Audio
Timeline, see Displaying and Modifying Keyframes in the Timeline.
Crossfading Audio Tracks
In the Keyframe Editor, you can view the audio tracks in your project, along with the Level
and Pan curves for each track.
To create a crossfade, add keyframes to the level curve of each track at the same (or nearly
the same) points where you want the crossfade to start and end.
Listen to the crossfade as you work. You may find that the best-sounding results are
achieved by having the level curves for the two tracks be slightly asymmetrical. This is
because the perceived loudness of different sounds with the same numerical value can
be different.
Syncing Audio and Video Tracks
Motion lets you determine how to handle the playback of audio if the audio tracks are
not in sync with the video. You can skip video frames to resync with the audio, or to
pause audio playback to avoid skipping frames if the video is out of sync.
To set audio sync preferences
1 Choose Motion > Preferences, then open the Time pane.
2 In the Playback Control section, select “Skip video frames” or “Pause audio playback.”
• If you select “Pause audio playback,” audio playback pauses when video and audio are
out of sync, then begins when audio catches up on the next loop. This enables an
uninterrupted flow of video frames (at the expense of playback slowing down) to
evaluate the look of your composition.
• If you select “Skip video frames,” video frames are dropped to enable an uninterrupted
flow of audio, for as close to real-time playback as possible.
Retiming Audio
Motion allows you to retime audio clips or channels to speed them up, slow them down,
or play them at a different speed.
Note: When retiming video, audio attached to the footage is retimed with it. You can
unlink video and audio to retime them separately. For more information on retiming
footage, see Retiming.
1379Chapter 23 Working with Audio