I finally had some time to experiment with Blue. I think it came out OK, especially for a first attempt. If you want to have a listen, here's the link:
https://soundcloud.com/dave-ranck/agnus-dei
 
I would still like to tweak a few syllables, including some of the dipthongs, and it could stand a gentle hand on expression also.
 
Blue is a lot of fun to work with. It's pretty intuitive and the vocal quality is excellent. I found that moving certain phrases forward in time before the natural beat improves the result considerably. The one thing that I would like to see added to Blue is a way to save off the phrases for later retrieval.

DRanck
...I found that moving certain phrases forward in time before the natural beat improves the result considerably...

 
Thanks for the tip on that.

DRanck
...The one thing that I would like to see added to Blue is a way to save off the phrases for later retrieval...

I'm kind of surprised it doesn't have that already, but yeah, that would be good.

DRanck
I found that moving certain phrases forward in time before the natural beat improves the result considerably. 

Don't most professional singers do that sometimes? I think it's called "feel".