What is ASIO and is there even any music, hell, games, that support 32/384? What about 32/192? Is it really able to do that all through just USB?
This is ASIO: http://en.wikipedia.org/wiki/Audio_Stream_Input/Output
ASIO is already included within the Bravo driver you need to install for UD120, so it is pretty much all set to go except that you need to use a software player that supports it (Foobar, Jriver, MediaMonkey, etc)
Don't really know any games or music that requires 32/384 at the moment, so it is mostly for future proofing. 24/192 music however is getting more and more common.
Of course it can do all of them through USB.