I have my PS3 connected to my computer via the optical output. The PS3 sound settings are linear PCM and I checked all the boxes in the optical output screen to enable various audio output formats (Dolby Digital 5.1, DTS, etc.). Now when I am in the initial PS3 screen showing all the games on my hard drive, there is sound. However, when I actually play the games there would be no sound. Things get weirder when I play DVD. There is no sound when I play at normal speed but there would be sound when I play at 1.5 x speed. Any idea??