Nope, with the newest Version of the Audio driver this is not possible. If you use an older Version of the Driver, the Headphone Surround mode on the Phoebus UI actually sets the Windows output to 7.1. Using this Surround Simulation you won´t be able to use Dolby HT4. I hope Asus gives us this option to put Windows into 7.1 mode in Driver releases in the future.