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MXDRV MML

This page is based on http://www16.atwiki.jp/mxdrv/pages/19.html, which is based on documentation from MXC, a MML compiler for the X68000. There are other compilers available as well, with more features, such as note.x (available here).

Lines starting with A-H or P are considered to be MML data.

Tempo and note lengths

If a note length is preceded by a '%', the length is in clock ticks. Example: c+%36. Note lengths can be connected using ^. Example: f2 ^ 8 ^ 192. Note length is up to 256 ticks. A quarter note is 48 ticks.

Conversion between OPM tempo and normal tempo (quarter notes per minute) works like this:

opm_tempo = 256 - 60 * opm_clock / (bpm_tempo * 48 * 1024)

and

bpm_tempo = 60 * opm_clock / (48 * 1024 * (256 - opm_tempo))

where opm_clock is 4MHz, or 4000000.

Simplified versions of these are:

opm_tempo = 256 - (78125 / (16 * bpm_tempo))

and

bpm_tempo = 78125 / (16 * (256 - opm_tempo))

Commands

Below, # represents a number.

t# Set the tempo, the number of quarter notes in one second.

@t# Set tempo by setting the value of OPM register B. Initial value @t200.

@# Set the current voice. Range is @0 - @255. Initial value is undefined.

o# Set octave. Range is o0 - o8. Initial value is o4.

< Transpose one octave below.

> Transpose one octave above.

l# Set note length. Default is l4.

a - g Note. Append a + to go up one semitone (sharp), and a - to go down a semitone (flat). Notes are followed by a numerical value to specify length. Otherwise the value of l# is used.

n# Note by numeric value. Range is n0 - n95. n0 is o0d+ and n95 is o8d. In this case, sound length is separated with a ,.

r# Rest. Length is the same as note length.

q# Staccato. Specify note duration, in eights of the full duration. Range is q1 - q8. Default is q8.

@q# Staccato, with note duration specified as number of ticks.

_ Portamento. If specified right after a note, the sound glides from one note to the next.

& Legato. Valid only right after a note, it disables key-off, therefore creating a legato effect with the next note.

v# Set volume. Range is v0 - v15. Initial value v8.

@v# Fine volume. Range is @v0 - @v127.

( Lower volume.

) Raise volume.

p# Pan. p0 = No output, p1 = Left only. p2 = Right only. p3 = Left and right. Default value p3.

L Specify loop start. After track ends, optionally loop from here (player will decide how many loops).

D# Detune in 1/64 semitones. Range is D-32767 - D32767. Initial value is D0.

[]# Repeat a specified number of times. Range is 2 - 255.

/ Inside a repeat, during the last repetition, skip from here to the end of the repeat.

y#1,#2 Write OPM register #1 with value #2.

k# Delay this many ticks before playing note. Default is k0.

w# Set OPM noise frequency. Range is w0 - w31.

S# Sync send. Resume playback on the specified channel, if it is in Sync wait mode. Values are A-H, P or 0-8.

W Sync wait. Wait for a Sync send command on another channel.

MP#1,#2,#3 Set Pitch LFO values.

  • #1: LFO waveform (0 = sawtooth, 1 = square, 2 = triangle)
  • #2: 1/4 LFO cycle in ticks
  • #3: LFO max amplitude

MPON Modulate Pitch ON. Enable pitch LFO.

MPOF Modulate Pitch OFf. Disable pitch LFO.

MA#1,#2,#3 Set Amplitude LFO values.

  • #1 LFO waveform (0 = sawtooth, 1 = square, 2 = triangle)
  • #2 1/4 LFO cycle in ticks
  • #3 LFO max amplitude

MAON Modulate Amplitude ON. Enable amplitude LFO.

MAOF Modulate Amplitude OFf. Disable amplitude LFO.

MD# Delay from key-on to the start of LFO modulation. Range is MD0 - MD255. MD0 means no delay. Does not apply to OPM LFO.

MH#1,#2,#3,#4,#5,#6,#7 Set OPM LFO values.

  • #1 LFO waveform (0 = sawtooth, 1 = square, 2 = triangle, 3 = noise)
  • #2 LFRQ
  • #3 PMD
  • #4 AMD
  • #5 PMS
  • #6 AMS
  • #7 Key sync. 0 = asynchronous, 1 = synchronous.

MHON Enable OPM LFO.

MHOF Disable OPM LFO.

! Ignore all following commands on the current channel.

F# Change PCM frequency. Default is F4

  • F0: 3.9kHz
  • F1: 5.2kHz
  • F2: 7.8kHz
  • F3: 10.4kHz
  • F4: 15.6kHz

Voice definition

If a line starts with @, it is the beginning of a voice definition. A voice can be defined at any point in the text.

@1 = {
	/* AR  D1R D2R RR D1L TL  KS MUL DT1 DT2 AME */
	   28, 4,  0,  5, 1,  37, 2, 1,  7,  0,  0,
	   22, 9,  1,  2, 1,  47, 2, 12, 0,  0,  0,
	   29, 4,  3,  6, 1,  37, 1, 3,  3,  0,  0,
	   15, 7,  0,  5, 10, 0,  2, 1,  0,  0,  1,
	/* CON FL OP */
	   2,  7, 15
}

Auxiliary commands

If a line starts with #, it is considered an auxiliary command.

  • #title "..." Define title of the song.
  • #pcmfile "..." Define a PDX file associated with this song. Extension is optional. File is searched in the same directory as resulting MDX file, or in a pre-defined PDX path.