DJMax Technika Q Song Format

Header

4 bytes unknown (always zeros?)
4 bytes offset to song information

Song information (usually at the very end of the file)

2 bytes number of sounds
2 bytes number of tracks?
2 bytes number of positions per measure?
4 bytes initial BPM (float)
4 bytes unknown
4 bytes unknown (another float?)
4 bytes unknown
4 bytes unknown

Sounds

Starts at offset 8
An array of entries that are 0x43 bytes in size each:
- 2 bytes index
- 1 byte unknown
- 0x40 bytes filename

Followed by 0x3d bytes of zeros.

Tracks

An array of commands (0xD bytes each):
- 4 bytes position
- 1 byte command type
- 8 bytes of params

Notes

The position refers to a position in the song
- Its meaning is determined by the number of positions per measure (in song info)
- Assumes 4/4 time signature?
Every track is separated by 0x3d bytes
There are usually 64 tracks
The playable tracks for 3 lines are (0 indexed in order of appearance in file):
- 0: top line
- 1: middle line
- 2: bottom line

Command types

0: Start of a track

Params

4 bytes num params * 16 (unknown use)
4 bytes num params

1: Sound

Params

2 bytes sound index
1 byte volume
1 byte pan
1 byte type
1 byte? length (for long notes, unit is a single position)
2 bytes unknown

Types

0: normal note (drag note if length != 0x6)
a: repeat note
b: last repeat note
c: hold note
5: first chain note (all notes in between have type 0)
6: last chain note
2: unknown

3: BPM change

Params

4 bytes float BPM
4 bytes unknown