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Basically you can leave Sensaura on all the time, except if you wanna watch to surround DVD's or do heavy music production (where you need small latency Asio/WDM/GSIF.
The thing is, the Terratec has hardware acceleration, but Sensaura is an extra software layer to emulate EAX1/2 (not HD yet) and A3D protocols. Audigy have EAX "hardwired" in the card (hey, it's their protocol!). So you won't notice a difference in sound if you listen to MP3/WAV players like Media Player or Winamp if you turn your Sensaura on or off. It's just because Sensaura is an extra software layer, that you'll need some percent of CPU more (it's not fully reverting to Software mode really). Some percentage, nothing to really worry about.
In fact the DMX and the Audigy are aimed at different people.
If you are a hardcore gamer that wants to make music on the side, go for the audigy by all means.
For the DMX it's the opposite. If you want to make music, but still want to have some decent "consumer" support like games and discrete surround (besides the digital stream), the DMX6fire is better. Much cleaner sounding, much better latency. Games are secondary.
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