Fading audio in and out
You can make an audio clip or native audio track fade in and out at any time during the audio.
To fade the audio in:
n Select the Fade In check box, and then click Plus (+) or Minus (-) to set the fade in time. (You can also type the numbers.)
To fade the audio out:
n Select the Fade Out check box, and then click Plus (+) or Minus (-) to set the fade out time. (You can also type the numbers.)