Adobe AFTER EFFECTS 5.5 Help Manual page 147

Adobe After Effects Help
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Time-remapping audio pitch
The Velocity graph in the Time-remap property directly relates to the pitch of an audio file.
By making subtle changes to the Velocity graph, you can create a variety of interesting
effects. To avoid screeching audio, you may want to keep the Velocity below 200%. When
the velocity (speed) is too high, use the Levels controls, located under the Audio property,
to control the volume.
You may hear clicks at the beginning and end of an audio (or an audio and video) layer
after setting new In and Out points in the Time Remap graph. Use the Levels controls to
remove these clicks; see "Using audio layers" on page 91.
To change the pitch of an audio layer:
1 In a Composition window or Timeline window, select the layer you want to remap.
2 Choose Layer > Enable Time Remapping.
3 Click the triangle to the left of the layer name to expand the layer outline.
4 Click the triangle to the left of the Time Remap heading to display the time graph for
time-remapping.
5 Move the current-time marker to the frame where you want change to begin, and then
click the keyframe navigator box.
6 On the Velocity graph below the keyframe, drag a marker, watching the Velocity value
as you drag.
To lower the pitch, drag the Velocity graph marker down.
•
To increase the pitch, drag the Velocity graph marker up.
•
To remove clicks from new In and Out points in the Time Remap graph:
1 If necessary, choose Window > Audio.
2 In the Timeline window, select the audio (or audio and video) layer to which you
applied time-remapping.
3 Expand the layer outline to display the Audio property and then the Levels property.
4 Move the current-time marker to the new In point and click the stopwatch icon next to
Levels to set a keyframe.
5 In the Audio palette, change the decibel value to 0.0.
6 Press the Page Up key on your keyboard to move the current-time marker to the
previous frame.
7 In the Audio palette, change the decibel level to -96.0.
8 Move the current time to the new Out point and set the decibel level to 0.
9 Press the Page Down key on your keyboard to move the current-time marker to the
next frame.
10 In the Audio palette, change the decibel level to -96.0.
You can change the decibel Slider Minimum value in the Audio Options dialog box,
which is available from the Audio palette window menu. See "Previewing audio" on
page 91.
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