Just in case it helps any of your schola members, here's an edition of Qui Manducat (communio of Corpus Christi, but also optional for OT21, hence my posting today)

This edition features the square note original, a transcription into modern notation, and a line-by-line translation. There is also a QR code to pull up a practice track recording.

For whatever reason, the forum won't accept my PDFs anymore, so here's a link: https://catholicsacredmusic.com/blog/free-transcription-qui-manducat-2026