In one of the churches that I have visited, I have experienced a Novus Ordo Latin Mass whose Canon goes as follows. The preface is sung as usual. Then while Sanctus is sung in a polyphony tone by the choir (while the people are still standing) the priest started to pray the Canon inaudibly. He stops right after the blessing of the bread and wine (in which he stretches his hands over the bread and wine). Then the choir ends at the first Hosanna in excelsis. The people then kneel and the priest continues the next part of the Canon, which is the consecration, audibly, until the Mysterium Fidei. The people then sing Mortem tuam annuntiamus Domine as usual, but after that, the remaining part of the Canon is again said inaudibly by the Priest, while the choir sings the rest of the Sanctus (Benedictus qui venit in nomine Domini, Hosanna in excelsis) and the people are still kneeling. The priest stops right before the Per ipsum and wait for the choir to finish, and sings the Per ipsum, audibly, at the end of which the people responds Amen.
Does this actually a common practice? And is this actually allowed? I have never seen this practice before, but I think this is a beautiful blending of the Novus Ordo’s Eucharistic Prayer and the way the Canon is prayed in the Old Rite of the mass, which I personally preferred. Inaudible prayers of the Canon, especially after the consecration, gives us a perfect solemn moment to pray from our hearts to Jesus who is truly present in front of us. Also, I feel that the rest part of the Canon does not need to be heard by the people, anyway.