5.1 surround sound does not work

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http://www.ubuntux.org – It seems 5.1 surround sound on Ubuntu 9.10 either does work or it doesn't end of story. Mine doesn't! I have trawled the universe for help and nothing works. I have an external usb 5.1 sound card made by Trust (thats what it says in the base speaker) I have no other info on this. So far I have followed some instructions and changed a command in somewhere to read default-sample-channels =6. Then rebooted and met with silence when I tried to do a speaker test. My 9.10 doesn't have the screen many instructions refer to. When I left click on the speaker at the top of the screen I get a thin vol (Distributions)