Arranging : Clip Loops and Groups : Fades and Crossfades on Clip Groups

Fades and Crossfades on Clip Groups
Clip groups can have fades and crossfades just like regular clips. Fades only apply to audio clips. In addition to crossfading between clip groups, you can also crossfade between clip groups and regular audio clips.
 
Two adjacent multitrack clip groups with crossfades on the audio tracks, but not on the MIDI track
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Ungrouping a clip group removes any clip group level fades or crossfades. Fades and crossfades are restored by the Regroup command.
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Clip groups that contain clips with fades are not allowed on Elastic Audio-enabled tracks.
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When changing tempo with clip groups on tick-based tracks, you may need to Ungroup, redo or create new fades, and then Regroup in order to maintain the fades.