You need either the advanced A/V pack or the HD A/V pack, an optical (TOSlink) cable, and a receiver capapble of decoding Dolby Digital and/or DTS signals. DD and DTS are not available via the regular L/R analog audio cables. If you use those, you will get Dolby ProLogic at best. If you have a PC with a sound card that decodes 5.1 digital audio, it might be possible to hook the Xbox to your PC and let your PC do the decoding task (Xbox sounds would come through your computer speakers).

You need either an optical input on your PC sound card or an optical-to-TTL adapter and TTL input on your PC sound card. Creative Labs 5.1 sound cards have a daughterboard available (at extra cost) that gives you an optical IN jack. This could theoretically be used to decode the Xbox signal, though nobody to my knowledge has tried it yet.

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