I have no solution for this. I work within the framework of XP12 and XP handles the interface with windows.
I believe I removed this checkbox option (though appears to still be in the docs....which I need to fix). There was a strange sound bug relating to that preference that I could not solve at the time.....I may revist it, but for now, its not supposed to be present. Thx for noticing that.
-tkyler