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(actions tracklist-selections-action)
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``(tracklist-selections-action-new-create-instrument pl_descr track_pos num_tracks)``
   Returns a new action for creating an instrument track.


``(tracklist-selections-action-new-create-audio-fx-with-plugin plugin_descriptor track_pos num_tracks)``
   Returns a new action for creating one or more Audio FX tracks with a
   plugin.


``(tracklist-selections-action-new-create-audio-fx track_pos num_tracks)``
   Returns a new action for creating one or more empty Audio FX tracks.


``(tracklist-selections-action-new-midi track_pos num_tracks)``
   Returns an action for creating one or more empty MIDI tracks.


