I have headphones through onboard audio set as the default playback device. I have HDMI set to listen stereo mix (onboard) under recording devices so that I can get duplicate audio on my headphones and TV. Windows 7 likes to set as HMDI audio as the default playback device when I am not looking (assumedly shortly after rebooting, but not quite sure when). And then I get no sound from my headphones because the programs are all playing on HDMI. Is there way I can fix this?