How to work with a sound [2/2]

A handle marks the beginning and ending of a rubber band segment, and you can drag the handle up or down to change the audio level. All audio clips include two handles that you can't remove (one at the beginning of the clip, and another at the end of it).

For example, when the sound starts and ends, you can drag the rubber band by making one click at the beginning and another click at the end, and then drag down the red rubber band at both points.
This will make the sound of the video start slowly and end slowly, making a vanishing sound effect.