Jeffrey, I love this piece too! We have done this at my parish. I looked everywhere for it but couldn't find it anywhere but the Simplex. I did find one YouTube video of it, and listening to it made me wonder if the Vatican edition is incorrect. Here's the video: http://www.youtube.com/watch?v=Zht3LsMalto
Skip ahead to 1:55. Starting at "Dominus," most of the recording is a step lower than written in the Vatican edition.
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