Audio effects, Backwards effect, Bass & treble effect – Adobe After Effects CS4 User Manual
Page 442: Delay effect, Flange & chorus effect
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USING AFTER EFFECTS CS4
Effects and animation presets
Last updated 12/21/2009
Audio effects
Backwards effect
The Backwards effect reverses the audio of a layer by playing the audio from the last frame to the first frame. The
frames remain in their original order in the Timeline panel. Select Swap Channels to swap left and right channels.
that shows how to use
the Backwards effect and the Reverb effect to create a creepy reverse echo result.
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Bass & Treble effect
The Bass & Treble effect boosts (increases) or cuts (decreases) the low frequencies (bass) or the high frequencies
(treble) of the audio. For greater control, use the Parametric EQ effect.
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Delay effect
The Delay effect repeats audio after a specified amount of time. This effect simulates sound bouncing off a surface, such
as a wall.
To simulate the acoustic ambience of a room, use the Reverb effect.
Delay Time
Time between the original sound and its echo, in milliseconds.
Delay Amount
Volume of the first delayed audio, as a fraction of the original.
Feedback
Amount of the echo that is fed back into the delay line to create subsequent echoes.
Dry Out, Wet Out
The amounts of the original (dry) sound and delayed (wet) sound in the final output. Values of 50%
are commonly used.
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Flange & Chorus effect
Flange is an audio effect caused by mixing the original audio with a copy that is delayed by a varying amount that cycles
over time. The frequency of the copy is also offset by an amount related to the delay. Chorus uses a larger delay, to
make one voice or instrument sound like many.
The default settings for the Flange & Chorus effect are for flange. To create a chorus result, use values something like
the following: 40 for Voice Separation Time (or higher for a greater chorus result), 4 for Voices, 0.1 for Modulation
Rate, 50% for Modulation Depth, and 90 for Voice Phase Change, with Stereo Voices selected.
Voice Separation Time
The time in milliseconds that separates each voice. Each voice is a delayed version of the
original sound. Use values of 6 or lower for flange, and higher values for chorus.