Originally Posted by AdamK47
The way to get 5.1 channel audio is to use Creatives Dolby Digital DTS Bitstream out with the Dolby Digital Live encoder. I've tried it out recently and I must say I'm very impressed. Not only do you get 5.1 channel audio, but X-Fi CMSS-3D and X-Fi Crystalizer work great with it. The only downside is Creative makes you pay extra to activate the Dolby software.
I think they bundle Dolby encoder with the sound cards now, anyway it was included free of charge with my X-Fi Titanium.