LINST=
LSONG=
LPATTERN=

'-----  header: 36 bytes

0d0000 = "AmBk"  (4bytes - String)
0d0004 = 3       (2bytes - BigEndian)
0d0006 = 0       (2bytes - BigEndian)
0d0008 = lenghts (4bytes - ver abaixo)
   lenghts=orbits(0x80000000,8+16+LINST+LSONG+LPATTERN)
0d0012 = "Music   " (8bytes - String)
0d0020 = 16             (4bytes - BigEndian) 
0d0024 = 16+LINST       (4bytes - BigEndian)
0d0028 = 16+LINST+LSONG (4bytes - BigEndian)
0d0032 = 0              (4bytes - BigEndian) 

'----- instrument
'----- song
'----- pattern