I'm answering the whole thread here.
You should be able to do 48 ET with the standard Lilypond font. You
can, for example, start with 12 ET and add arrowed accidentals to get
12*3=36. Then add 12 quartertones to get 48 ET. All you need is to
define new note names.
I found the font wasn't good enough for 72 ET, and I don't think that's
changed. Which is a shame, because it should be easy for somebody
familiar with Lilypond's font workflow to add the arrows to quartertone
symbols and that's all you need to get 72 (24*3). I did find enough
symbols for 60-ET and I use 60 and 72 as output formats for tripod
notation as it happens. From what I remember, there are a lot of flat
symbols that can be interpreted in different ways, but not so many sharps.
It would be nice for regular.ly to be included in the standard
distribution, but that's irrelevant here. What regular.ly does is
retune the note names for a different size of fifth. 48 and 72 ET keep
the same fifth as 12 ET. What you need is a new "language" for the note
names and appropriate glyphs.
I have files to support arbitrary fonts but there are issues with the
spacing. I have an experimental branch for Extended Helmholtz-Ellis JI
Pitch Notation with Bravura but it doesn't solve any problems with the
dedicated HE font. (This is the "eheji" branch in the microlily
repository.) This particular notation always needs "text" fonts because
it builds glyphs into strings to make the accidentals. The standard
accidental code only uses one glyph at a time which is good enough for
72 but not Helmholtz-Ellis. Still, having Bravura blessed as a Lilypond
font would be both a good thing and quite a bit of work.
It's unfortunate that my library is out of date. It's good that
convert-ly fixes it. One issue with this is that libraries (at least
the way I use them, which may also be out of date) don't declare the
Lilypond version. It's in the including score file and if the included
file also declares a version there is (or was) an error.
Anybody can fork the repository and keep it up do date. I can add the
license of your choice if you care about such things.
Graham
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