Chants for 'Sabbato Sancto' on fol. A are found with the same liturgical order in P-BRs Ms. 32, fol. 201r et sequitur (http://pemdatabase.eu/compositions?src=2902&feast%5B%5D=1003&string=&cid=&office=&category=All). The only difference between these two sources is the third resposory of the third nocturn which is respectively 'Domine post passionem', Cantus ID 006504 (P-BRam Nº9 Códices) and 'Sicut ovis', Cantus ID 007661 (P-BRs Ms. 32). On fol. Av the scribe wrote 'Heloy heloy lama sabathani deus meus deus meus ut quid me dereliquisti' without notation at the end of Matins (right column) but later on, this text was struck through. Some of the chants on fol. B are found in P-BRs Ms. 32 for 'Fer. 5 p. Pascha' but the two liturgies differ. On the other hand, the same series of chants on fol. B can be found in the same order in E-Tc 44.2, fols. 95r-96r for 'Fer. 4 and 5 p. Pascha'.
The comparison of the chants on fol. A with the office for 'Sabbato Sancto' in E-Tc 44.1 fol. 75rv shows partial correspondence between the chants in the two sources: not only the third responsory of the third nocturn is different but also the antiphon for Prime.
Non-central bifolium. Catchword on fol. Bv 'Venit'.
Description of the notation:
Small size neumes around a red line. Presence of custodes where needed. The axis of the notation is vertical. The lozenge is used consistently both in isolation and in compound neumes (either ascending or descending patterns). The difference between a lozenge and a more or less square punctum is clearly defined. Chants in 4th mode have the line which means F, not E.