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 CMF Header

 The header block is built up as follows :-

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   Offset |  Usage
 ---------+-----------------------------------------------------------------
   00-03  |  File ID - 'CTMF'
   04-05  |  File format version, Major version in MSB, minor in LSB
   06-07  |  Offset of instrument block from start of file
   08-09  |  Offset of music block from start of file
   0A-0B  |  Number of timer ticks per beat (quarter note). Default 48
   0C-0D  |  Clock ticks per second. Default 96
   0E-0F  |  Offset of music title from start of file. Null terminated
          |  ASCII string
   10-11  |  Offset of composer name from start of file
   12-13  |  Offset of remarks string from start of file. (Max 32 bytes)
   14-23  |  Channel-in-use table. Indicates which of 16 FM channels are
          |  used. Corresponding byte set to 1 if channel is used
   24-25  |  Number of instruments used
   26-27  |  Music tempo
   28-    |  Title, Composer and Remark strings (if any)
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