Wonderswan music format

32 byte header
- 0x00 - 0x01 Identifier (TBD)
- 0x02 Default speed
- 0x03 Pattern count
- 0x04 - 0x05 Tempo
  - Default value 240 (125bpm)
  - Calculated with 12000*60 / bpm*24
31 x 32 byte instruments
- 16 bytes info
  - 0x00 Default volume
- 16 byte waveform (unsigned 4bit packed nybble)
256 byte order list
- Pattern number 1 byte
- 0xFF = end of list
?? x 1024 byte patterns
- 64 rows per pattern
- 16 bytes per row
- XX YY ZZ WW XX YY ZZ WW XX YY ZZ WW XX YY ZZ WW
  - XX = pitch
    - 0x00 = no note
    - 0x01 - 0x0c = Octave 0 (Only G-0 to B-0)
    - 0x0d - 0x18 = Octave 1
    - 0x19 - 0x24 = Octave 2
    - 0x25 - 0x30 = Octave 3
    - 0x31 - 0x3c = Octave 4
  - YY = instrument number
  - ZZ WW = Effect + parameters (Protracker)
    - 0x00 - Arpeggio (Protracker compatible)
    - 0x01 - Porta up (NOT Protracker compatible)
    - 0x02 - Porta down (NOT Protracker compatible)
    - 0x05 - Porta to note + Volume slide (Protracker compatible, only volume slide implemented)
    - 0x06 - Vibrato + Volume slide (Protracker compatible, only volume slide implemented)
    - 0x0a - Volume slide (Protracker compatible)
    - 0x0b - Jump to position (Protracker compatible)
    - 0x0c - Set Volume (Protracker compatible)
    - 0x0d - Pattern break (Protracker row jump not implemented)
    - 0x0f - Set Speed (Protracker speed only, no tempo)

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