Apple Motion 2 - Manual (Page 896)

896 Chapter 13 Working With Audio
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 ” on page 437 for more information. Only the Linear
interpolation method is available for Level.
Creating Fade-ins and Fade-outs
You can create a fade-in by setting the track level to a lower value, adding keyframes at
the point you want the sound to fade in, then dragging those keyframes to a higher
value.
You can create a fade-out by adding keyframes at the point you want the sound to
fade out, then dragging those keyframes to a lower value.
Cross-fading 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 cross-fade, add keyframes to the level curve of each track at the same (or
nearly the same) points in time, where you want the cross-fade 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 cross-fade 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 audio 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 choose “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.
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