An audio waveform automatically displays in the Time Slider when you import an audio file.

To change the default color of the waveform by changing the Sound color swatch in the Color Settings (in the Animation section).
If you import more than one audio file, the Time Slider automatically switches to Use Trax Sounds mode, representing each sound file as a solid line instead of a waveform.
There are three ways you can specify which audio file displays in the Time Slider
in the
Playback Options and choose from the list of audio files loaded in the scene.
The audio file waveform for the sound you select displays in the Time Slider and plays during playback.
To display multiple audio files on the Time Slider

You can disable the audio file from the scene or you can remove an audio file completely:
There are three ways to delete audio files from your scene
in the
Playback Options and expand the
Delete Sounds rollout, where a list of all the audio files associated with the scene displays. Choose the file you want to delete.
There are two ways to clear audio files from the Time Slider
in the
Playback Options and select
Off.