"28. In the case of low Masses, too, let special care be taken that the faithful are present "not as strangers or as mute spectators", but that they exercise the kind of participation which is required by so great a mystery and which yields most abundant fruit."
"31. A third and more perfect [see note 1, below] form of participation is achieved when the faithful respond liturgically to the priest celebrant, taking part as it were in a dialogue with him, and saying aloud the parts that belong to them.
In this more perfect form of participation, four degrees or stages can be distinguished:
a) The first degree, when the faithful make the easier liturgical responses in answer to the priest celebrant: namely, Amen; Et cum spiritu tuo; Deo gratias; Gloria tibi Domine; Laus tibi, Christe; Habemus ad Dominum; Dignum et iustum est; Sed libera nos a malo;
b) The second degree, when the faithful also say the parts which according to the rubrics are to be said by the server, and if holy Communion is distributed during Mass, also [the Confiteor and (see note 2, below)] the triple Domine, non sum dignus;
c) The third degree, when the faithful recite with the priest celebrant parts of the Ordinary of the Mass as well, namely: the Gloria in excelsis Deo; Credo; Sanctus-Benedictus; Agnus Dei;
d) The fourth degree, when the faithful likewise say aloud with the celebrant parts what belong to the Proper of the Mass: Introit; Gradual; Offertory; Communion. This last degree of participation can be employed with fitting dignity only by more advanced groups well trained for it."
"32. In low Masses the entire Pater Noster, since it is a fitting and ancient prayer of preparation for Communion, may be recited by the faithful together with the priest -- but only in Latin, with all adding the Amen. In no case may this recitation be in the vernacular."
"34. The priest celebrant, in pronouncing all those parts which according to the rubrics he must say aloud, should, especially if the church is large and the congregation numerous, so raise the voice that all the faithful will be able to follow the sacred action properly and conveniently."
"This Instruction on sacred music and the sacred liturgy was submitted to His Holiness Pope Pius XII by the undersigned Cardinal Prefect [C. Cardinal Cicognani] of the Sacred Congregation of Rites. His Holiness deigned to approve it in its entirety and in all its parts. He commanded that it be promulgated and be conscientiously observed by all whom it concerns.
Anything whatever to the contrary notwithstanding.
Rome, from the office of the Sacred Congregation of Rites, on the feast of St. Pius X, September 3, 1958." [see note 3, below]
NOTES
1. The original Latin text here reads as follows: "31. Tertius denique isque plenior modus obtinetur ...." A.A.S. (1958) 642. At least one translation uses "most perfect" for plenior, perhaps because the third form is one of three, but the Latin clearly uses the comparative. Also, one wonders if using "more perfect" rather than "fuller" or "more complete" for plenior evidences a personal bias on the part of the translator.
2. This so-called third Confiteor of the Mass was eliminated in the revision of the Ritus Servandus for the 1962 Roman Missal.
3. The Venerable Pius XII, Pope, died on 9 October 1958, a little over a month after the promulgation of this Instruction.