I 'm afraid I’m utterly unable to get it to work. For some reason, Dorico gives the impression that it will recognize the COLR property, but it’s failing to preview or export it properly. During testing, I had seen that it appeared to work in Dorico, so I didn’t think to actually test an exported PDF.
The font is entirely correct in its construction of the color glyph, as far as I have been able to tell. It works as expected in Word, for example (this is a PDF export):
I thought about a workaround of a playing technique that could be placed directly on the staff, so I tried creating custom playing techniques that were colored, but that path is a dead end. For some reason, they appear in the score as black, no matter what color I choose. I will start a separate thread for this, which feels like a bug to me.
The only solution I have been able to come up with is to create an actual text item, color it white, and drag it into place on top of the regular punctum. That works but is annoying. I’ll continue to refine a way to solve this.
EDIT: that doesn’t work because of this.