A-i provides an introduction to the Office and an explanation of the editorial method.
A-ii contains the calendar of the liturgical year.
D-1 contains all of the settings of the Invitatory Psalm (used at the beginning of Matins).
D-2 conrtains all the psalm-tones as well as the ornate settings of the Benedictus and Magnificat, and the required full-settings of Tonus Peregrinus.
The last file contains the tones of the Gloria Patri as used at the conclusion of great responsories.