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- --------M-MOD-M-----------------------------
-
- The Protracker composer is a composer for digital music. The MOD files
- are a quasi standard for digital music, all words are in Motorola byte
- order. The original MOD format allowed only 4 digital channels and 15
- instruments, the specification became enlarged (maybe by Mahoney and
- Kaktus??) to 4 channels and 31 instruments. Check the file at offset
- 1080d for the signatures 'M.K', '4CHN', '6CHN','8CHN','FLT4','FLT8. If
- you find any of them, the module uses 31 instruments. With rising sound
- quality on the PC and other platforms, the old MODule format has been
- replaced by numerous other formats. The 4/15 format has almost become
- extinct. Below, only the 4/31 format is descripted.
-
- The digital sample data is signed (two's complement) as necessary for
- the Amiga, the sample data immediately follows the pattern data. Maybe
- this is not valid for some 8CHN files; One of the two I have, uses Intel
- byte ordering and unsigned samples.
-
- OFFSET Count TYPE Description
- 0000h 20 char Song title, padded with spaces
- 0014h 31 rec Sample description record
- For original MOD files, the number of
- instruments would be 15.
- 22 char Sample name, padded with zeroes to
- full length.
- 2 word Sample length / 2. Needs to be multiplied
- by 2 to get the actual length. If the sample
- length is greater than 8000h, the sample
- is bigger than 64k.
- 1 byte Sample finetune. Only the lower nibble is
- valid. Fine tune table :
- 0 1 2 3 4 5 6 7 8 9 A B C D E F
- 0 +1 +2 +3 +4 +5 +6 +7 -8 -7 -6 -5 -4 -3 -2 -1
- 1 byte Sample volume (0-40h)
- 1 word Sample loop start / 2
- 1 word Sample loop length / 2
-
- 950d 1 byte Song length in patterns (0-80h)
- 951d 1 byte Restart byte for song looping (Noisetracker?)
- 952d 128 byte Pattern play sequences
- 1080d 4 char ID='M.K.', ID='4CHN',ID='6CHN',ID='8CHN'
- ID='4FLT',ID='8FLT'
- If this position contains 'M.K.','8CHN',
- '4CHN','6CHN','FLT4' or 'FLT8' the module
- has 31 instruments.
- 1084d ? rec Patterns
- Each pattern has 64 rows.
- Depending on the number of channels, each row
- has from 4 to 8 notes. The channel count is
- determined by the ID. (see table 0005)
- The number of patterns is the highest pattern
- number stored in the pattern list.
-
- Each note has four bytes. Four notes make
- up a track in a four channel MOD file. Each
- track is saved sequentially :
- byte 0-3 4-7 8-11 12-15
- Chn #1 Chn #2 Chn #3 Chn #4
- byte 16-19 20-23 24-27 28-31
- Chn #1 Chn #2 Chn #3 Chn #4
- 1 word Instrument / period
- The instrument number is in bits 12-15, the
- 12-bit period in bits 0-11.
- 1 byte Upper nibble : Lower 4 bits of the instrument,
- Lower nibble : Special effect command.
- 1 byte Special effects data
- (Table 0005)
- Protracker 16 note conversion table / MOD Period table
- +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
- PT16 : I 1I 2I 3I 4I 5I 6I 7I 8I 9I 10I 11I 12I
- MOD : I 1712I 1616I 1524I 1440I 1356I 1280I 1208I 1140I 1076I 1016I 960I 906I
- Note : I C-0I C#0I D-0I D#0I E-0I F-0I F#0I G-0I G#0I A-0I A#0I B-0I
- +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
- I 13I 14I 15I 16I 17I 18I 19I 20I 21I 22I 23I 24I
- I 856I 808I 762I 720I 678I 640I 604I 570I 538I 508I 480I 453I
- I C-1I C#1I D-1I D#1I E-1I F-1I F#1I G-1I G#1I A-1I A#1I B-1I
- +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
- I 25I 26I 27I 28I 29I 30I 31I 32I 33I 34I 35I 36I
- I 428I 404I 381I 360I 339I 320I 302I 285I 269I 254I 240I 226I
- I C-2I C#2I D-2I D#2I E-2I F-2I F#2I G-2I G#2I A-2I A#2I B-2I
- +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
- I 37I 38I 39I 40I 41I 42I 43I 44I 45I 46I 47I 48I
- I 214I 202I 190I 180I 170I 160I 151I 143I 135I 127I 120I 113I
- I C-3I C#3I D-3I D#3I E-3I F-3I F#3I G-3I G#3I A-3I A#3I B-3I
- +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
- I 49I 50I 51I 52I 53I 54I 55I 56I 57I 58I 59I 60I
- I 107I 101I 95I 90I 85I 80I 75I 71I 67I 63I 60I 56I
- I C-4I C#4I D-4I D#4I E-4I F-4I F#4I G-4I G#4I A-4I A#4I B-4I
- +-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
-
- EXTENSION:MOD,module
- OCCURENCES:AMIGA,PC
- PROGRAMS:DMP,ModEdit
- VALIDATION:NONE
-