Lol and to be honest I don't think you ever will... Unless you get one of the actual software engineers talking.
Can more people test this out and post their results.
Guys. I just tested it again for you but with a youtube-video http://www.youtube.com/watch?v=OpIddQyhpSo&hd=1
headphone stereo=speaker stereo. With SBX off it's the same.
SBX headphone (windows 5.1) is NOT like SBX speaker stereo
SBX headphhne (windows 2.0 to have the same channel as the speakers) is also NOT like SBX speaker stereo.
In both SBX cases it's about the total loss of an attempt to create a phantom center when you listen to SBX speakers on your headphones. Everything's on the extreme left and right. That's how SBX speaker is actually supposed to work.
*EDIT* Thanks all Feg and DJ (it was both questions I was wanting official confirmation from Creative about: headphone mode via optical, and speakers mode via optical - both with working SBZ surround)
Creative's 'support' site team can go and stuff themselves. Again, I only wanted official confirmation from Creative so please forgive.
Eyeing up the Yulong D100 MKII < Optical < OEM SBZ. Head-Fi inflation.
Don't have one yet DJ!
The OEM Z - It'll be hit or miss I imagine, especially if your system is overclocked (like mine's is). By how much, or if any I cannot speculate. Mind you my old X-Fi Xtreme Gamer Fatal1ty Pro (no EMI either) sat in my ridiculously overclocked rig 4-5 years ago and no problems. From what I've heard though (as you'll very likely know).. a clean PSU and good MB helps. SSD too.
Sorry I can't help - only looking for ideas for my next setup - and there's a ****tone of them here.