CS:S I assume refers to Counter Strike: Source As for your surround sound question I found informationregarding as to a 5.1 setup in the steam help but as for 7.1 I have yet to se any information on it.
I did some diging for you and here is a comment in a review for Half Life 2:
Sound
The sound in the game is amazing. For those lucky ones that have a 5.1 or 7.1 sounds system, the support is terrific. It really helps set the atmosphere even more, with 3D positiona audio creating distinct sounds from different directions. This immerses you even further in the game.
The same story for graphics goes for sound support, the better hardware you have the better Half Life 2 is going to sound.
Sounds for explosions and gun fire are nicely sampled and well chosen for the task. This, combined with the graphics, really increases the gaming experience.If the reviewer is correct then indeed yes it supports it but I would not know. I only use a cheap 2.1 setup.
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