1: Connect PS3 Optical OUT to Sound Card Optical IN (going through a receiver should also be fine)
2: Set PS3 sound output to Optical.
3: Set Sound Card output to Analog and Input to Digital. Depending on the card, you may need to enable Hardware Monitering. (Example, my Razer Barracuda will produce no sound to my analog 5.1 output using Optical IN unless I turn on monitering from the control panel for my Optical Input. This may be the issue you are having).
ca doit bien pouvoir se faire tout en analogique 
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