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Containers allow to pack multiple tracks into one item. This is useful when you, for example, need to create a non-breakable group of tracks.
Container item is cross-faded according to the tracks it contains. Fade in for the container item is equal to fade in of the first track in the container. Fade out and mix are equal to fade out and mix of the last track in the container. You can also pack ads playlists into a container. Container contents can be edited: right-click it in the playlist, select Tools->Edit/rename.