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Description of the (extended) music macro language
==================================================
Based on http://www.antonis.de/qbebooks/gwbasman/play.html and
http://www.mirbsd.org/man4/spkr which, in turn, are modelled after
the IBM BASICA “PLAY” command.
Symbols of MML
--------------
:A-G[#,+,-][length]:
A-G are notes. # or + following a note produces a sharp; - produces a
flat.
:L(n):
Sets the length of each note. L4 is a quarter note, L1 is a whole note,
and so on. n may be from 1 to 64. Length may also follow the note to
change the length for that note only. A16 is equivalent to L16A. Default
is L4.
:ML:
Music legato. Each note plays the full period set by L. While not
explicitly specified, most implementations tie sequences of identical
pitch where all (but the last) are styled legato. Otherwise, or if
the pitch differs, the notes are played with a slur.
:MN:
Music normal. Each note plays seven-eighths of the time determined by L
(length). This is the default.
:MS:
Music staccato. Each note plays three-quarters of the time determined by
L.
:N(n):
Play note n. n may range from 0 to 84. In the 7 possible octaves, there
are 84 notes. n set to 0 (or omitted) indicates a rest.
:O(n):
Octave 0 sets the current octave. There are 7 octaves (0 through 6).
Default is 4. Middle C is at the beginning of octave 2. The special
values L and N control octave tracking. L enables octave tracking, N
disables it; with octave tracking enabled, jumps between notes are
limited to 6 half-tones, otherwise, the octave is incremented or
decremented accordingly. Octave tracking is disabled by default.
Octave tracking is suspended for one note after an octave change,
including setting the default octave at the beginning of the track,
and only applies to letter notes.
:P(n):
Pause. n may range from 1-64; the current L value is used if omitted.
:T(n):
Tempo. T sets the number of L4s in a minute. n may range from 32-255.
Default is 120.
:. (period):
A period after a note increases the playing time of the note by 3/2
times the period determined by L (length of note) times T (tempo).
Multiple periods can appear after a note, and the playing time is scaled
accordingly. For example, A. will cause the note A to play one and half
times the playing time determined by L (length of the note) times T (the
tempo); two periods placed after A (A..) will cause the note to be
played at 9/4 times its ascribed value; an A with three periods (A...)
at 27/8, etc. Periods may also appear after a P (pause), and increase
the pause length as described above.
:>:
A greater-than symbol raises the current octave by one.
:<:
A less-than symbol lowers the current octave by one.
:\|:
Optionally used as a synchronisation mark for multi-track music. This is
a proprietary extension in the Floppi-Music project.
Comments
--------
Lines starting with # are comments. At the beginning of the file,
comments may be used to encode metadata. This is yet to be specified.
The current implementation parses key/value pairs separated by a colon
and a space, strips both key and value, lower-cases the key and adds it
to a dictionary.
The MusicXML export currently specifically recognises these keys:
- Title, Copyright, Encoder (person), Source
- Composer, Lyrics, Arranger, Translator *xor* Artist (deprecated, only
one)
Any other key is treated as miscellaneous field.
Voices
------
The voices of a song are interleaved. They are grouped per notation
system, and the notation systems are seperated by empty lines.
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