Ive an audigy 2, so in your creative task bar for the live software there should be "Speaker set up" option yours at the moment is probably set to 2.1 just change it to 5.1 and bobs your uncle. Go into mix vibes somewhere there should be audio setup just change the settings for the montor/cueing channel to rear speakers (if you have rear speakers, remove the jack from your soundcard and plug the phones in there mate
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Andy