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(audio tracklist)
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``(tracklist-insert-track tracklist track idx)``
   Inserts track ``track`` at index ``idx`` in the tracklist.


``(tracklist-get-track-at-pos tracklist pos)``
   Returns the track at ``pos`` in the tracklist.


``(tracklist-get-num-tracks tracklist)``
   Returns the number of tracks in the tracklist.


