Audio Autofade by in/out points

Automatically fade a layer's audio in and out based on its in and out points

After Effects CS4
Transitions
Presets (ffx)

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It's just a simple adaptation of the built-in FadeIn+Out-Frames behaviour, but applied to the Stereo Mixer audio effect instead.
Apply the preset to to your Audio Layer. Set the number of frames required for fade in and fade out in the first slider effect, and the layer will then automatically fade from 0 to 100% and back again for the defined durations. To further adjust the overall volume, use Level or a second iteration of Stereo mixer.

by Andrew Yoole

Or just apply the Stereo Mixer to the Audio Layer and apply the expression to the Left Channel. Then pickwhip the Right Channel to left:

//adjust the fade duration(in frames)
f_in=15;
f_out=15;
fadeInDuration = thisComp.frameDuration * f_in;
fadeOutDuration = thisComp.frameDuration * f_out;
fadeInVol = linear(time, inPoint, inPoint+fadeInDuration+0.001, 0, 100);
fadeOutVol = linear(time, outPoint-fadeOutDuration-0.001, outPoint, 100, 0);
(fadeInVol * fadeOutVol) / 100

Effects & Plugins

Stereo Mixer

(Min. Version: After Effects CS4, Category: Transitions, Type: Presets (ffx))

posted by MicGyver on Nov 28, 2010

Ducking Audio Preset/Expression

A great time-saving preset to "duck"(fade in/out) a music layer based on a voice over.
"Ducking - Audio Terms Explained - Process of automatic compression, eg when the announcer's voice signal causes the level of music to be attenuated."(from lp2cd.com)

After Effects CS3
Useful things
Presets (ffx)

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posted by MicGyver on Oct 25, 2009

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Controlling sound volume without dB

A few simple expressions to convert from dB to volume-Percentages, this way sound will respond more like opacity...

After Effects CS3
Useful things
Presets (ffx)

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posted by MaxX on May 10, 2010

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Audio Autofade by in/out points

Effects & Plugins

Related topics:

Ducking Audio Preset/Expression

Controlling sound volume without dB