Creative audigy Rx User Manual page 32

CMSS delivers rich 3D virtual surround sound with headphones or 2-speaker system, and mul-
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tichannel audio playback with 4.1, 5.1 or 7.1 speaker systems.
Stereo Surround duplicates the front channel audio to all surround speakers without any artificial
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enhancements.
Using Your Sound Blaster Audigy 5/Rx Control Panel 32