What's the advantage of this program over using the keyboard's mixer to change voices?
Now, I'm far from being an expert, but from what I know, it's impossible to change all style voices in (keyboard) mixer alone. Although there are ways (I guess) to change on keyboard "all" voices used in style, that's VERY time consuming process.
There are so many styles available for download.. from various keyboards, many already revoiced (from what to what keyboard?).. and I realized, big majority of them sound quite lousy.. many times because "missing" voices (for MY keyboard).
I suggest you make a "test". Take few styles you downloaded somewhere, and take a look with Y-StyleRevoice.. Ok, is possible it's not useful for you.. it's just one of many tools
Bogdan