Apple Motion 4 - Manual (Page 1347)

2 Option-click the blue pan curve to add a keyframe.
3 Drag the keyframe up or down to set the pan position you want at a specific time.
Drag down to pan to the left, or drag up to pan to the right.
4 Add any other keyframe you need, and drag each one to set its value.
Note: When modifying Pan values, you can Control-click a keyframe to display a shortcut
menu that lets you set different interpolation methods between points on your curve.
See
Modifying Curves for more information. Only the Linear interpolation method is
available for Level.
Crossfading Audio Tracks
In the Keyframe Editor, you can view the audio tracks in your project, along with the level,
pan, and speed 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 in time, where you want the crossfade to start and end. You can use
the frame numbers in the ruler of the Audio Editor for reference.
Be sure to 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 in
the Audio Editor 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 choose to skip video frames in order to re-sync 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 click the button for the Project pane.
2 In the Playback Control section of the Project pane, click the “Skip video frames” button
to skip frames, or click the “Pause audio playback” button to pause audio playback.
When you select “Pause audio playback,” audio playback pauses when video and audio
are out of sync, then begins playing when it catches up on the next loop.
Retiming Audio
Motion allows you to retime audio clips or individual channels to speed them up, slow
them down, or play them back at a different speed. All of the controls below can apply
either to a stereo audio clip, or individual channels.
1347 Chapter 20 Working with Audio