To load an audio file into your scene
The peaks of the sound waves are visible in the Time Slider, and the Time Slider is ready to play or scrub the sound.
To display sound on the Time Slider
-click
the Time Slider.

The audio file’s waveform appears in the Time Slider and it plays during playback.
Suppose you create an animation that begins with a flash of lightning, then plays the sound of thunder, then ends with the sound of rainfall. You have two different sound files, thunderstorm.aiff and rainstorm.aiff.
The following example describes how to import and play the two sound files after the animation.
To use contiguous audio files with animation
A thunderstorm audio node is created, and you will see the sound waves in the Time Slider.
A rainstorm audio node is created. The Time Slider continues to display the thunderstorm sound. The animation starts with 3 seconds of lightning. The thunderstorm sound starts after 3 seconds of play.
and
change the Start Time to 72 (3 seconds
at the default Time Unit of 24 frames per
second).
You will now see the sound waves representing the thunderstorm sound appear in the Time Slider starting at time 72.
The rain sound begins at 5 seconds (or time 120 on the Time Slider).
window
and set the Start Time to 120.
To view your animation with both soundtracks (the thunderclap sound followed by the rain sound), you will have to render your animation to video and overlay each of the soundtracks onto tape.