Ipse invocabit me alleluia pater

Source: 
Sankt Gallen, Stiftsbibliothek, 388
Folio: 
053
Sequence: 
7
Feast: 
Nativitas Domini
Office/Mass: 
M
Genre: 
A
Position: 
2.4
Cantus ID: 
003402
Mode: 
5?
Differentia: 
v?
Manuscript Reading Full Text (standardized spelling): 
Ipse invocabit me alleluia pater meus es tu alleluia
Manuscript Reading Full Text (MS spelling): 
Ipse invocabit me alleluia pater meus es tu alleluia
Indexing notes: 
differentia is perhaps "u (v?)"