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With this expression you can achieve ducking audio in Ae, author Nathan Gambles had post in videocopilot a explication and guide to use: “Just get your audio layers together, convert the voice over to keyframes, apply the expression controls to the bg audio layer, link them all up like in the picture and adjust the settings to your liking “
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.
Duration: 10 MinVersion: CS3Plugins: No
Rich Young: “The 1st part is the workmanlike approach, both slightly simpler and quicker, and ideal if you are only controlling a couple of items with your audio. Version 2 shows how to keep all the controllers on a single layer and is better suited for more complex projects with many layers, which need good organisation.”
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