Critical melody http://www.omnigreg.at/wiki/doku.php?id=ant:1490 following carolingian variant for the third Sanctus; AM34 follows the beneventan variant.

Editions with rsigns tend to either have puncta mora on the second syllable of the first two Sanctus, which is exaggerated, (LU61...) or episemata, which is not found in H (AM34). Sandhofe chose to add quarterbars to indicate some amount of pause between the Sanctus. I kept this idea.

Accent on Ángeli

I wonder if this could be considered 1st mode. Musically it is very obviously mode 2 but a lot of mss have it as mode 1.