Editing MDL.TXT (section)

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=== The Trackdatas (TR) ===
<pre>
Offset Lenght Description

000    002     "TR"; trackdata-ID
 002    004     blocklenght
 006    002     number of tracks
 008    ???     track-datablocks; every trackdatablock is stored in this way:
		Ofs.000 Len.002         length of the trackdatas
		    002 <trackdatalen>  datas for this track

Every track consists of 1-256 notepositions and every notposition contains
6 bytes:

byte 0              - note-value; 1 = C-0, 2 = C#0,..., 120 = B-9,
		      0 = nothing (---), 255 = key off (^^^)
byte 1              - instrument-number; 1-255; 0 = nothing
byte 2              - volume; 1-255; 0 = no volume change
byte 3, low nibble  - number of the first effect-command
byte 3, high nibble - number of the second effect-command (commands "g"-"l"
		      get the numbers 1-6)
byte 4              - databyte for the first effect-command
byte 5              - databyte for the second effect-command

Digitrakker stores the tracks in a packed way. The structure of this VERY
effective (!!!) packformat is the following:

bit 76543210
byte 0 - xxxxxxyy

if yy = 00 -> <xxxxxx>+1 is the number of the empty notepositions which are
	      following.
if yy = 01 -> the last noteposition will be repeated <xxxxxx>+1 times.
if yy = 10 -> the noteslot from position <xxxxxx> is copied to the actual
	      position.
if yy = 11 -> the following datas will be put in the actual noteslot:
		bit 2 = 1 -> note
		bit 3 = 1 -> sample
		bit 4 = 1 -> volume
		bit 5 = 1 -> effectcommand numbers
		bit 6 = 1 -> databyte for effect 1
		bit 7 = 1 -> databyte for effect 2
              If the bit is not setted, the byte isn't stored and you have to
              take 0 instead.

To find out the number of notepositions in a track you should decrease a
counter (startvalue: length of the packed trackdatas) while depacking.
Every depacked track has to be filled out with 0-values up to position 256.
When you copy the track into a pattern just take the number of positions you
need for the pattern (if the pattern has a length of 64 positions only take
the first 64 positions from the track).
</pre>

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Editing MDL.TXT (section)

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