FYI, some "Extended Helmholtz-Ellis JI” accidentals [1-2], in fact designed quite recently, but a nice input. There is also a Unicode font at [3]. Notation also mentioned at [4].
The arrow accidentals that LilyPond has, are used for syntonic comma 81/81 alterations (staff system in Pythagorean tuning). LilyPond does not have those for double sharps and double flats. In addition, there are accidentals with double arrows, for double syntonic comma alterations, which LilyPond does not have. (And even triple arrows.) Some traditional quartertone accidentals end up on the 11-limit rational interval 33/32, which seems to be a good idea: in E72, it is approximated with E24 quartertones. 1. http://www.newmusicbox.org/assets/72/HelmholtzEllisLegend.pdf 2. http://www.marcsabat.com/pdfs/notation.pdf 3. http://www.marcsabat.com/ 4. https://en.wikipedia.org/wiki/Just_intonation _______________________________________________ lilypond-devel mailing list lilypond-devel@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-devel
