RIFF1
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l-15-14-15-17-15-14-15/19--------------l
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l-15-14-15-17-15-14-15-12---11---------l
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RIFF2l--------------------------------------ll-88-88--10---10-10---8-8--------------ll-77-77---9--9-99-9--7777--------------ll--------------------------------------ll--------------------------------------ll--------------------------------------l pm .. . . . .
RIFF3l-x-x-101010--x-x-101010---------------ll-7-7--7-7-7--7-7--7-7-7---------------ll--------------------------------------ll--------------------------------------ll--------------------------------------ll--------------------------------------l