From my testing, I'm not sure that is correct. The very first thing that happens when you click on the Vocal Synth button in BIAB is that a file, Sound.XML is created in the folder /bb/Data/SRequest
I get two results when using the "automatic" Sinsy button, one of which is a standard audio .wav file, the other is suffixed .XML, but upon examining the contents of that file I find only the Lyric Data in it, the Note entries are all empty at that time.
I see no Pitch entries either.
I do see Note Duration entries, though.
No note data = not a complete .XML file at all to me.
No notes means "no chords" which is kind of defeating of the xml point.
Once the thing comes back from Sinsy is a different story, though. Now the missing Note and Duration data appears.
Apparently Sinsy analyzes the .wav soundfile created and sent as well as entering data into that .xml file and returning it to us.
--Mac