Stereo expand (CMSS-3D eq.) in Linux, does it exist?

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http://www.linuxforums.org – Hi all. I'm currently using Windows with my Creative X-FI XtremeMusic sound card, and Creative has this feature called CMSS-3D which allows you to expand stereo music to all of your speakers (I've got a 5.1 setup). I'd really like to switch full-time to Linux but my music is utterly important to me and I'm desperate to know if there is a feature like CMSS-3D available on Linux. Perhaps not in the driver but as a software plugin or just something that works? Regards, John (HowTos)