Hi Matthew,
Am 29.10.24 um 20:33 schrieb msk...@ansuz.sooke.bc.ca:
I'd like to engrave music with quarter-tones in Lilypond, and generate
MIDI that will sound correct when played. Lilypond is supposed to support
that but I've run into some issues with actually doing it.
First: quarter tones are implemented by emitting the nearest 12-ET note
and a quarter-tone pitch bend if applicable, so that for instance cih'
(quarter tone sharper than Middle C) is MIDI note 60 (c') with a +50 cent
pitch bend. And MIDI pitch bends affect the entire channel; so if there
are two notes that require different bend amounts, then they have to be in
different MIDI channels.
Yes, that's a known limitation and drawback of LilyPond's microtonality
implementation. Some time ago, I managed to change this in a local
branch of mine (cf.
https://lists.gnu.org/archive/html/lilypond-user/2024-01/msg00220.html
and
https://lists.gnu.org/archive/html/lilypond-user/2021-05/msg00059.html),
and still have to keep my promise to polish this into becoming a merge
request. Some things changed in my life over the last few months,
keeping me from contributing to LilyPond, but I still hope I can get
back to this soon.
Lukas
