For example, even tho my usb headset (logitech g35) as default device, voice was coming out from AMD HDMI Output. And then if I disable that device, it comes out from Digital Audio (S/PDIF). AND THEN if I disable that device as well, then it comes out from my speakers. AND THEN if I disable that also, I get no audio at all. This only happens to some youtube videos, not all. But other videos are fine. Any ideas?