Information on differentia
Differentiae in the Klosterneuburg manuscripts are written in the margins of the manuscripts, but staff lines (usually just the F and/or C line) are extended into the margins to clarify the pitched content of each differentia. The original Cantus index for this manuscript coded the differentiae with a two-digit system: an upper-case letter to indicate the final pitch of the differentia within each mode followed by a sequentially-ordered numeral. The coding system was consistent throughout the eight Klosterneuburg manuscripts.
Lacoste, Debra. Inventory of Klosterneuburg, Augustiner-Chorherrenstift - Bibliothek, 1017. In: Cantus Manuscript Database for Latin Ecclesiastical Chant: Inventories of Chant Sources. Directed by Debra Lacoste (2011-), Terence Bailey (1997-2010), and Ruth Steiner (1987-1996). Web developer, Jan Kolácek (2011-). Lacoste, Debra. “The Earliest Klosterneuburg Antiphoners.” Ph.D. dissertation, The University of Western Ontario, 1999.
Images available as microfilm from the Monastic Microfilm Project (Number 6002) (1966). The manuscript is not yet fully digitized online.