Text corrections according to BR. However, the structure of this R/ does not follow BR, for musical reasons. Following BR here would ruin the repetition of "in saecula".

Added neumes. pisut1 on the melisma should be piM1sut1, oriscus+2tractuli, not oriscus+1punctum+1tractulus. (btw, piM1 should be named piS)

Changed pi to piM1 (oriscus+tractulus, as found in Jakub's latest update)