The way /usr/share/lilypond/current/ly/makam.ly is written suggests that
Lilypond determines which accidental is appropriate for a pitch from one
quantity only, namely by how much it is higher or lower than the MIDI pitch of
the same letter-name and the same octave. Taking an example from makam.ly, you
may, for example, associate a downward inflection by 1/9 of a tone with the
accidental glyph "accidentals.mirroredflat", but that glyph must serve for c,
d, e, f, g, a and b.
Is there any way to make Lilypond select an accidental in some other way?
Possibly related to both the amount of offset and the letter name?
Sort of something like this?
myGlyphs = #`(
;;;;; etc.
(-1/34 . ,(if (eq? somethingorother 3) "accidentals.natural"
"accidentals.natural.arrowdown" ))
;;;;; etc.
)
\layout {
\context {
\Score
\override Accidental #'glyph-name-alist = \myGlyphs
}
}
Thing is, I don't know the data structures that Scheme can see, or even if it
is possible to encode such a conditional expression in the alist so that it
works.
The reason I ask is that I'd like to compose in 34et (temperament that divides
the octave into 34 equal intervals). In this temperament, the tone (say f to g)
is 6/34 of an octave, so the tritone from f to b is 18/34 of an octave. This
means that b lowered by one step is higher than f by 17/34 of an octave, that
is, half an octave, or exactly 6 MIDI semitones. This means that b lowered by
one step and f need identical amounts of MIDI pitch bend but different
accidental glyphs.
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