Please note that the Flash display of the book gives a very poor impression of the music notation, which when printed is actually perfect!
The Ferial Responses occur as one set before the canticles, and as another set after the creed. The part of the priest designated Cantor is scored for a baritone but is with the range of both tenors and basses. The Cantor's part is scored to be accompanied by the organ, but the choral parts are A cappella.
The Benediction in B flat Major is set to music antiphonally as the prayer is otherwise too short. The piano part does not reflect this.