I dunno if Word 2007 supports ligatures, but I doubt anyone is still using that. It might've worked in InDesign, but not in Word. '7p' producing a squiggly line + a note on the bottom pitch, rather than a note on the 7th pitch. To start, I may have solved Palestrina's problem from nine years back, namely that ligatures and/or glyph substitution was not working, i.e.
I may post a few findings of interest here, as I learn more. Here is a newbie at font engineering, learning by fire. I've been hacking at Caeciliae square-notation font inside FontForge.