Just what it says on the tin! I transcribed this directly from a 1732 manuscript in my collection. The melody is not in Gregobase (at least, not with this text).
I’m grateful that you all have had more info on the melody. I’ll have to update the blog post when I get a chance. Interestingly, I like this corrupted variant better than the official versions that are still extant in the repertoire.
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