How to set Fade in and Fade out audio in Windows Movie Maker

Fading out is a common audio transitions. Audio fades in and increases to the maximum volume, and fades out and decreases to the maximum volume. 

Fade audio in or out

1. Select the music on Timeline and click the "setting" icon to enter the setting mode.

2. You can set gradient here and drag the slider to set the duration.

3. Click "Return" to save your change.