I'm trying to get surround sound to work on my MacBook Pro in Amnesia and Crysis. I have an early 2011 MBP running Windows 7 in Boot Camp hooked up to an Onkyo TX-SR607 A/V receiver. In the sound options it looks like audio over HDMI only supports 2 channels, which is unfortunate because that would be the ideal setup. I am trying to use the S/PDIF port and a fiber optic cable to my receiver to get surround sound, but games revert to stereo for some reason. When I test the sound settings in the Properties page for Digital Audio (S/PDIF), I do get a test sound through each of the 5 speakers. What do I need to change for that to work in games?