The best luck I've had is mapping breath2 as an Expression controller in the Aria software. Most hardware works with that as a continuously variable volume parameter OK, with the caveat that many of them only allow you to vary between the initial ve…
Like I said, I've had my best results by setting CC2 to "Expression." There is a limit to what you can do if either the voice or the program don't know how to respond to the "Breath Controller" signal - those apps will get their initial attack volum…