> Based on a group of byzantine fonts, I made my own ByzLily.otf.
> Font "ByzLily.otf": https://disk.yandex.ru/d/jW8aScwbZvgzgA
Nice! Is there a documentation that maps character codes to glyph
descriptions?
> In LilyPond, there is no way to combine characters from different
> fonts qualitatively.
This is normal. You can't do that with other typesetting systems
either. You could define LilyPond macros to combine glyphs from
different fonts, though.
> A single font allows you to use different elements of byzantine
> notation in one text. The music is entered as a text string under
> the note carrier.
Yes. However, I can imagine that a macro solution would be more
flexible, for example, to select a style X that combines Church
Slavonic font X with the Byzantine neumes.
> Tell me, how can text syllables of byzantine notation be aligned in
the center of the notes?
Normally, you can center-align lyrics with the command
```
\override LyricText.self-alignment-X = #CENTER
```
Maybe this works for you, too.
>
> Program text [...]
Please send an image that shows the output. :-)
Werner