So I've got a few questions...
Dolby Headphone and CMSS both require hardware for processing right? Meaning, either a soundcard capable of it, or something like the MixAmp. Is there a way to do this without upgrading my soundcard on my PC?
Would a program like Isone Pro work for games? It has a feature which allows surround sound, and increased soundstage, when listening to music. I was wondering if this could work for games also. This seems like an alternative to purchasing a soundcard.
Lastly, is it possible to connect a PS3 to a computer, so Isone Pro can provide the surround sound?
In theory, it's quite possible in software. In practice, making it work in games without the proper hardware is quite troublesome. It's much easier and more practical to just get a sound card, especially when the only possibly useful software solutions still cost money.
Isone Pro/TB_Isone/etc. is useless for gaming, because it's a Winamp/VST/etc. media player plugin. Games cannot interface with such things.
You could connect a PS3's S/PDIF output to a PC, but then you have the problem of not being able to decode Dolby Digital or DTS at the driver level, meaning you either get stereo PCM or absolutely nothing. Many other people have already tried and failed to make a PC with a sound card serve as a makeshift Mixamp...