Excellent! For a music project of mine I found MusGlyph [1] which is also all about ligatures, like typing ssss for 4 beamed sixteenth notes. There are some ligatures I need that are not in the font, I contacted the author and he encouraged me to add them myself. So now I’m spending quality time with FOSS called FontForge. Also subsetting a ligature-heavy font for the web turns out an interesting challenge. Wrote up my experience here [2]

[1] https://www.notationcentral.com/product/musglyphs/ [2] https://highperformancewebfonts.com/read/subsetting-and-liga...