I can't think of anyone on this site who uses that off the top of my head, since most folks seem to avoid vocal works like the plague. (Mainly because the sound options in Finale and Sibelius don't give you a good sense of what you're writing, from what I can tell.)
If no one can give you an answer here, try the forums on CPDL (choralwiki.org). I know at least one of the site admins there uses this type of program, although I'm not sure if it's that particular one or not. He runs the choralia.net site when he's not doing CPDL. The forums on CPDL are pretty dead, but the admins are very active and very helpful, so if you throw a post out, you should get an answer. (: