You're wrong. I managed to install dolby theatre V4 too. I don't know what it does but it's useless. I doesn't have Dolby headphone. There's a Surround virtualization with a speakers/headphones slider. One doesn't seem to do anything perceivable, the other just doesn't change much. Also you're wrong about the difference about xonar/realtek, it's not because of that. If I enabled DH in foobar I get the same sound that I'm familiar with. With realtek's driver I get a totally butchered garbage sound for headphones. (Virtual Speaker seems to work normally though...) Oh well. Too bad I wasted so many hours for this.