I make of this something like:"Quae nota brevis per se tempts incertum exprimit: ita ut valor ejus syllaba cui incidit definiatur. Valet ergo regula : Cantabis syllabas sicut pronuntiaveris."
The short breve in itself has an uncertain duration, its value being that of the syllable it coincides with. Therefore the rule applies: Sing as you speak.
The Pustet/Haberl team taught singers to use “mensural” rhythm when singing plainsong. Haberl’s axiom was “sing as you speak”—that is, sing the chant as you would speak it
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