intro
14-----14-----14--15-----14-----14-----14--15----------------------- (play twice)
 - 12-12--12-12--12--12----12-12--12-12--12--12---------------------
main
-----------------------------------------------------14-----14--15--14-----14----14--15
-----------------------------------------------12-12--12-12---12--12--12-12-12-12--12--12  (reapeat 4 times)
----------------------------------------------0---------------------0
-------------------------0--------------------0---------------------0
play intro again
14-----14-----14--15
--12-12--12-12--12--12  (reapeat twice)