Re: accidentals for just intonation

[Graham Breed]

On 03/12/15 12:11, N. Andrew Walsh wrote:

> If your system requires only a range in cents to determine which accidental
> to use, that should be easy to calculate and apply. If it requires only the
> prime factors of the ratios, that should be easy, too. If it's some mixture
> of them, that works as well. And for all of them, it should be possible to
> output something different to different instrumental parts, as needed.

Prime factorization to control the accidentals wasn't easy when I looked 
at it.  The only information available when the accidental was chosen is 
the pitch-difference, so that's what I used.  There are ways 
communicating, though, like choosing different accidental sets according 
to the factors or building the accidental string recursively.  Maybe 
it's easier with new versions of Lilypond and improved documentation.  I 
did this a while ago and learned the internals as I went along.  I 
welcome assistance from more experienced Lilypond-Schemers, and if it's 
going to be re-implemented from scratch, at least my code's there as an 
example of what can work.


                Graham