Re: ly:pitch-alteration

[Freeman Gilmore]

On Tue, Jul 21, 2020 at 4:24 AM Hans Åberg <haberg-1@telia.com> wrote:
>
>
> > On 21 Jul 2020, at 05:08, Freeman Gilmore <freeman.gilmore@gmail.com> wrote:
> >
> > This is where I got ly:pitch-alteration. from, but I do not know how
> > to use it:
> > http://x31eq.com/lilypond/
>
> This is Graham Breed, you might check out some of his posts here on the 
> LilyPond lists.
>
> > The Pitch Model
> >
> > Pitches in Lilypond are a combination of the position on the staff,
> > and the alteration relative to the nominal at that position, as a
> > rational fraction of a 200 cent whole tone. Pitch names repeat every
> > 1200 cent octave. You can create a pitch with ly:make-pitch and find
> > out about an existing pitch with ly:pitch-octave, ly:pitch-notename,
> > and            ly:pitch-alteration.            There's also
> > ly:pitch-steps, which is a combination of ly:pitch-octave and
> > ly:pitch-notename, and ly:pitch-semitones which can be risky in a
> > microtonal context.
>
> It is very complicated to use. You might try the regular.ly file which allows 
> for ETs in the MIDI output. I can send you some examples for some of them, 
> like E53. Graham has made a file that allows for more complicated 
> microtonality, by using a high ET so that the microtones do not clash.
>
It looks like I misunderstand what  ly:pitch-alteration.is used for.
I was thinking it could use it To check on what is going on in a
program or check or follow what you have written.   Graham did not say
that though.    Just a thought, do not put any more time on this.

Thank you, ƒg