Sound Problem Ubuntu 12.04, 5.1 Center and Subwoofer swapped

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http://ubuntuforums.org – Hi, Well I installed Ubuntu a couple of days ago and, first I had no audio, but solved it with Alsa-mixer. Now I play the sound test, I try with center and plays it with subwoofer, and viceversa. I saw somewhere that with this command (gksu gedit /usr/share/pulseaudio/alsa-mixer/profile-sets/default.conf) I can swap the channels editing the text. I tried but at restart didn't work. Intel P4 @2.80 Ghz Intel D865PERL mobo Creative SB Live! sbo100 7/4 Gb RAM Please Help! I love Ubuntu so much!!! (Hardware)