You can fade in the beginning of audio regions, and fade out the end of audio regions (including audio Apple Loops).
Fades are only visible if you are zoomed in enough to see the waveform in the audio region. You can create a fade using either the Fade tool or the Fade In and Fade Out parameters in the Region inspector.
Create a fade-in or fade-out with the Fade tool
Select the Fade tool.
Do one of the following:
Drag over the start or end point of an audio region.
A fade-in or fade-out is created. The length of the fade drag area determines the length of the fade, so a longer drag area results in a longer fade time, and a shorter drag area, a quick fade.
Drag over the end point of one audio region and the start point of the region that follows.
This technique works even if the two sections don’t directly adjoin each other.
With the Fade tool selected, you can edit fades on regions after you make them.
Create a fade-in or fade-out using the Region inspector
Select one or more regions.
Set the value for the Fade In or Fade Out setting in the Region inspector by dragging the pointer vertically, or double-clicking and entering a value.
Fades created using the Fade tool and the Region inspector are interactive. After you create a fade using the Fade tool, for example, you can adjust the fade using the Region inspector Fade In or Fade Out parameters.