No, the octave flats in the key signature isn't a mistake: it was common practice in the day; but if I were preparing a modern edition in modern notation (and not this!), then I wouldn't have two B flats in the key signature on every staff and system. I'd display it in the incipit, though.
BTW, the hyphens in your example are a bit mad. They're quite high up on the body, and variable in length. Is Lilypond drawing them? You seem to have to specify two hyphens in the code just for one gap, and an underscore for each missed-out syllable...?
Here's the LP output (with settings to stick to the facsimile, not perfect but actually my very first attempt with ancient notation):
Absolutely fantastic, well, LilyPond is truly exciting software in exciting hands!
Freelance Composer. Self-Publisher. Finale 25.5 • Sibelius 2020.12• MuseScore 3 • Logic Pro X+ • Ableton Live 10+ • Digital Performer 9 /// MacOS Mojave (secondary in use systems: Fedora 35, Windows 10)
You seem to have to specify two hyphens in the code just for one gap, and an underscore for each missed-out syllable...?
Yes. But: Frescobaldi has a nice tool to automatically insert hyphens using hyphenation dictionary. It works pretty well for me, both for German and English language (and Latin using the German dictionary). The only extra hyphens that I have to add is where in written text there would be none (i. e. if you would have a single letter syllable as in A-bend, O-si-an-na, A-men).
benwiggy wrote: ↑
[...] BTW, the hyphens in your example are a bit mad. They're quite high up on the body, and variable in length. Is Lilypond drawing them? [...]
Yes it's LilyPond. Is this an issue?
(In any case, it could be customized.)
Those hyphens aren't mad, quite the contrary! Yes, they're a bit high and the long ones might be a tad too long, but in my opinion the fact that Lilypond is able to shorten hyphens dynamically to minimize rhythmic distortion is just another testimonial of excellence.