ON PLAY(n) - Event trapping statement that specifies a subroutine to
             branch to when there are too few notes in the music queue
Syntax
  ON PLAY(queuelimit) GOSUB {linelabel | linenumber}
    - queuelimit, an integer expression, is the minimum number of notes
      to maintain in the background music queue (between 1 and 32)
    - linelabel or linenumber is the first line of the event-handling
      subroutine to branch to when the number of notes in the music
      buffer goes from queuelimit to queuelimit - 1
 
See Also  <PLAY ON, PLAY OFF, PLAY STOP>  <PLAY>