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I can output it from VLC/MPlayerX, but I'm not sure how I can get 5.1 working in the Witcher 2 on my new iMac?

I've got optical out to an Marantz AV receiver, and then from receiver to surround sound speakers.

Is there something I've missed to get it working?
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To update the setting on the iMac itself:

Audio MIDI setup
Source: Digital Out
Format: 96000.0 Hz 2ch-32bit Float

Sound
Output: Digital Out
optical digital-out port