WASAPI 2.1 is working but for some reason Windows 7 seems to be incapable of outputing sound to two applications. If I switch on Foobar then that plays fine but flash video and games have no sound. The same if vice-versa.
Can't get ASIO working either for some odd reason. It plays and is detected in the WDM Device List, giving no error but outputs no sound.
I'm using 7100 RC x64 by the way. Could be I messed up somewhere, or it's a problem with x64, or perhaps 7127 has fixed it for others.
Was fidgeting around in the sound settings and there's a section called "Exclusive Mode", for allowing applications to take exclusive control and to give them priority. Both are ticked and unticking either fudges everything though.
EDIT - NVM about ASIO it works now. If you're having the same problem, you need to install your SPDIF drivers, even if W7 can already trasmit sound through your optical/coaxial, they're necessary for ASIO to work.