How do you generate keyframes based on the amplitude of an audio layer?

The process of generating keyframes based on the amplitude of an audio layer involves using the audio-specific feature that allows the conversion of audio data into keyframe attributes. Choosing to right-click and access the "Keyframe Assistant" followed by the option to "Convert Audio to Keyframes" is the correct method in After Effects for this.

This function takes the amplitude data from the selected audio layer and transforms it into keyframes that can control properties of other layers, such as position, scale, or opacity, based on the audio's volume levels. This feature is particularly useful for synchronizing animations with the rhythm or beats of the sound, thereby allowing for dynamic visual effects that react to audio cues.

Other choices lack the specificity needed to directly convert audio into a format that produces keyframes tied to audio amplitude. The option about generating an audio layer doesn't pertain to creating keyframes. Similarly, the creation of audio effects focuses on altering audio characteristics rather than linking them to keyframe animations. Therefore, the correct choice is the one that explicitly mentions converting audio to keyframes, as that is the essential function that addresses the requirement of generating keyframes from audio properties.