Files containing note information (i.e. songs) are suffixed with ".ROL".

("File version" and "editing scale" are non-musical information used by Visual

Composer (TM).)

 

Structure of .ROL files:

__________________________________________________________________

 

fld #   size   type     description

        (bytes)

 

1       2       int     file version, major

2       2       int     file version, minor

3       40      char    unused

4       2       int     ticks per beat

5       2       int     beats per measure

6       2       int     editing scale (Y axis)

7       2       int     editing scale (X axis)

8       1       char    unused

9       1       char    0 = percussive mode

                        1 = melodic mode

10      90      char    unused

11      38      char    filler

12      15      char    filler

13      4       float   basic tempo

 

Field 14 indicates the number of times to repeat fields 15 and 16:

 

14      2       int     number of tempo events

15      2       int     time of events, in ticks

16      4       float   tempo multiplier (0.01 - 10.0)

 

The remaining fields (17 to 34) are to be repeated for each of 11 voices:

 

17      15      char    filler

18      2       int     time (in ticks) of last note +1

 

Repeat the next two fields (19 and 20) while the summation of field 20 is

less than the value of field 18:

 

19      2       int     note number: 0 => silence

                        from 12 to 107 => normal note (you must

                        subtract 60 to obtain the correct value

                        for the sound driver)

20      2       int     note duration, in ticks

21      15      char    filler

 

Field 22 indicates the number of times to repeat fields 23 to 26:

 

22      2       int     number of instrument events

23      2       int     time of events, in ticks

24      9       char    instrument name

25      1       char    filler

26      2       int     unused

27      15      char    filler

 

Field 28 indicates the number of times to repeat fields 29 and 30:

 

28      2       int     number of volume events

29      2       int     time of events, in ticks

30      4       float   volume multiplier (0.0 - 1.0)

31      15      char    filler

 

Field 32 indicates the number of times to repeat fields 33 and 34:

 

32      2       int     number of pitch events

33      2       int     time of events, in ticks

34      4       float   pitch variation (0.0 - 2.0, nominal is 1.0)

 

Notes

_____

 

Fields #1 and #2 should be set to 0 and 4 respectively. Field #10 should

be filled with zeros.

 

PS:

a 4 byte 'float' in the 80x86 family look like follows:

 

Sign   biased

-bit  exponent  significant

 31    30..23     22..0

               ^

                `- here an implicite "1." is assumed

               exponent bias = 127 (0x7F)

 

eg. 0.5 = 1* 2^(-1) ==> sign=0, exp=127-1, signif=(1.)0000000

 

10987654 32109876 54321098 76543210

33222222 22221111 11111100 00000000

0         0000000 00000000 00000000

 0111111 0