http://www.arkivmusic.com/classical/Drilldown?name_id1=7493&name_role1=1&bcorder=1&comp_id=414263
I downloaded this from emusic yesterday. Very tasty!
I remember some people complaining that the Mass needed a professional organist. Now, I'm not one, but it doesn't sound like there's anything particularly difficult about the part. But then, how many professional organists are there in the Church? Maybe Boosey should come out with the Big Note version.