mirror of
https://github.com/sshlien/abcmidi.git
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148 lines
4.2 KiB
Plaintext
148 lines
4.2 KiB
Plaintext
%%splittune
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%%textfont Helvetica 14
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%%scale .9
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%%begintext obeylines
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=================
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temperamentlinear
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=================
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%%endtext
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%%begintext justify
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Microtone accidentals can be used along with temperamentlinear.
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In that case, the accidental ratio is based on the new chromatic semitone size,
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defined as 7 fifths minus 4 octaves. (Run abc2midi with the verbose
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option (-v) to see the temperament values.)
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As an exception, the microtonal deviation in cents can be represented
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by using denominator=100 in the accidentals. Example:
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%%endtext
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X:1
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T:\%\%MIDI temperamentlinear - microtone accidentals in cents
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%%postscript /ft5475{M -3 3 RM 6 -6 RL 2 SLW stroke}def
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%%postscript /ft35939{2 copy ft0 M -7.5 -3 RM 12 F3 (7) show}def
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M:none
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K:C
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%%scale 1.3
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V:1
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%%MIDI program 17
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%%MIDI temperamentlinear 1200 702 %% Pythagorian tunings
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%%MIDI makechordchannels 3
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"^Pure;major;chord"\
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[C_22/100EG]8 y |\
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"^Pythagorian;major;chord"\
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[CEG]8 y ||\
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"^Pure;4:5:6:7;chord"\
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[C_22/100EG_141/100B]8 y |\
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"^Pythagorean;7-chord"\
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[CEG_B]8 y ||
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%%newpage
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%%begintext obeylines
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================
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temperamentequal
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================
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%%endtext
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%%begintext justify
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New command.
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\%\%MIDI temperamentequal <ndiv> [octave_cents] [fifth_steps] [sharp_steps]
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This commans sets a tempered scale defined by 'ndiv' equal divisions
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of 'octave_cents' (default is the octave = 1200 cents).
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The optional parameter 'fifth_steps', if provided, is an integer that
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defines the size of the fifth in steps of the temperament.
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This sets where is the note G in the temperament.
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When 'fifth_steps' is omited or 0 (zero), the program computes it
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as an approximation of the frequency ratio 3/1, minus the
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(possibly tempered) octave.
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The optional 'sharp_steps' defines the meaning of the accidentals.
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'sharp_steps' is the number of steps between a natural note and
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a sharpened note (e.g. between =C and ^C).
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By default, the size of a sharp/flat deviation is based on the
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size of the chromatic semitone in the specified temperament: 7 fifths minus
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4 octaves. The values in use in the temperament can be viewed
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by running abc2midi with the command-line option -v (verbose).
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With temperamentequal (as with temperamentlinear), microtone accidentals
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are interpreted as fractions of the sharp size in the
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specified temperament, except if they use denominator=100, which
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defines microtonal deviations in cents.
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The conventional temperament can be reset with the command temperamentnormal.
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See also: temperamentlinear, temperamentnormal, makechordchannels
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Example:
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%%endtext
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X:2
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T:\%\%MIDI temperamentequal
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%%stretchlast 1
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M:none
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L:1/2
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K:C
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V:1
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%%MIDI program 44
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%%MIDI makechordchannels 3
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%
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%%text \%\%MIDI temperamentequal 7 1200 4 \% N.B.: fifth = 4 steps
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%%MIDI temperamentequal 7 1200 4 % N.B.: fifth = 4 steps
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"^Octave divided in 7 equal parts"\
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c d e f g a b c' & [I:MIDI=program 44] C8 | [CEGc]2 z |
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%
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%%text \%\%MIDI temperamentequal 17
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%%MIDI temperamentequal 17
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"^Octave divided in 17 equal parts"\
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=c ^/c ^c =d _/d _d =c & C7 | [CEGc]2 z |
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%
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%%text \%\%MIDI temperamentequal 22 \% N.B.: 1/3-sharps
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%%postscript /sh2{M 0 -5 RM 14 F3 (/) show}bind def
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%%postscript /sh258{2 copy M -7.5 -5 RM 14 F3 (\\) show sh0}bind def
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%%postscript /ft2{M 0 -5 RM 14 F3 (\\) show}bind def
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%%postscript /ft258{2 copy M -7.5 -5 RM 14 F3 (/) show ft0}bind def
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%%MIDI temperamentequal 22 % N.B.: 1/3-sharps
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"^Octave divided in 22 equal parts"\
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=c ^1/3c ^2/3c ^c =d _1/3d _2/3d _d =c & C8-C | [C_1/3EGc]2 z |
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%
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%%text \%\%MIDI temperamentequal 31
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%%MIDI temperamentequal 31
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"^Octave divided in 31 equal parts"\
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=c ^/c ^c ^3/c ^^c =d _/d _d _3/d __d =c2 & C12 | [CEGc]2 z |
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%
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%%text \%\%MIDI temperamentequal 19
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%%MIDI temperamentequal 19
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"^Octave divided in 19 equal parts"\
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=c ^c ^^c =d _d __d =c & C7 | [CEGc]2 z |
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%
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%%text \%\%MIDI temperamentequal 19 1205
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%%MIDI temperamentequal 19 1205
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"^Streched octave (1205 cents) divided in 19 equal parts"\
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=c ^c ^^c =d _d __d =c & C7 | [CEGc]2 z |
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%
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%%text \%\%MIDI temperamentequal 11 1200 7 1
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%%MIDI temperamentequal 11 1200 7 1
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"^Octave divided in 11 equal parts"\
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c __d _d =d ^d ^^d =e =g ^g ^^g =a =c' & C12 |
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%
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%%tex \%\%MIDI temperamentnormal
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%%MIDI temperamentnormal
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"^Conventional temperament: octave divided in 12 equal parts"\
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c _d =d ^d =e =f ^f =g ^g =a _b =b =c'2 & C14 |
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