Digital audio-in to line-out?

Hello all,
I've just got myself a PS3 and am wanting to route the digital audio from my PS3 to the Mac and out to my speakers. I have the optical cable going in the digital-out of the PS3 and in to the digital-in of my Mac Pro. Looking at the Sound preference panel, I'm getting a signal because the input signal is flickering. I can't seem to get any audio out from it though. Digital-in is selected but am having no joy.
I downloaded the demo of Audio Hijack and this works fine - I can get audio from the PS3 to my Mac and out through my speakers, however I'd rather not have to use this software to do a simple task.
Can anyone suggest what I might be missing or not doing? Is there another sound control panel I might need to use to route the audio out?
Thanks!
Alastair

When I run AudioHijack Pro and route the audio from digital-in, it works fine. Also, viewing the input page on the sound preference pane, the input level shows activity so I know sound is working. However, I can only route audio using audio hijack pro.

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