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audio tracklist
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Scheme Procedure: **tracklist-insert-track** | *tracklist track idx*
   Inserts track track at index idx in the tracklist.


Scheme Procedure: **tracklist-get-track-at-pos** | *tracklist pos*
   Returns the track at pos in the tracklist.


Scheme Procedure: **tracklist-get-num-tracks** | *tracklist*
   Returns the number of tracks in the tracklist.


