Did you ever get NVRAM working properly? I can't seem to get mine to work with or without the EmuVariableUEFI
Edit: I seem to have gotten audio working using the VoodooHDA driver.
Awesome! You saved me so much time! BTW - I just kept trying all the VoodooHDA drivers until one worked.
ASUS Maximus VII Formula Watchdog board -> Voodoo 2.7.3