thanks for the upload. Don't you have the Gloria as well? Also as a suggestion for revision, the typeset is wasteful of paper - some pages could easily have accomodated multiple systems and reduced the page count, since the Kyrie and Benedictus comprise only two systems of music yet are stretched out to two pages.
I have done the Credo and first set of responses. What's left is the second set, the Pater Noster (Lord's Prayer) and the Gloria. I work on them during lulls in my day job. I use MuseScore (Beta) and am still learning all it's niceties. As with most Open Source applications, the instructions are a bit lean. Christopher Braginetz