I've done a couple songs using Sinsy - for example, Words Like Smoke.

The early BiaB support for Sinsy had a number of problems which might have turned people off from using it. For example, syllables had short rests between them, so words often were mispronounced. There was a bug which caused some notes to be exported as naturals instead of flats. I think these have both been corrected, although I've never gotten confirmation back from my bug reports.

I wish that the people working on Sinsy had used a native English speaker, because the /R/ and /L/ aren't very distinct. But the voices are very natural, and there are a number of YouTube videos showing off what's possible.

-- David Cuny
My virtual singer development blog

Vocal control, you say. Never heard of it. Is that some kind of ProTools thing?