Thanks for the information, blog post, and explanation. Much appreciated.
I was wondering why, if XACT was upgraded, that it is still version 3.0 in both GS 3.1 and GS 4.0. I think people may have caught on more quickly if the version number was also updated. (I'm sure the internal version number shown in the About dialog was changed, but the major/minor version was not, unless I am mistaken.)
-- Jason Doucette