Ubuntu no Sound from Optical OUT

Ubuntu no Sound from Optical OUT I installed a new sound card, a Turtle Beach card, and can't seem to get sound out of the optical out. lspci says it is a CM8738 chip. I can get static out the front two channels with the following command but that is it so far (when the test says center, nothing works):
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Guest [Entry]

"Basic troubleshooting steps (taken from the DigitalOut with ALSA page I posted to your earlier question):

Check that the card is found and available (already done! good job!)
Check mixer settings (try TonyUser's suggestion of gnome-volume-control-pulse first, then try running alsamixer and seeing if you need to adjust things there as well).
Try playing back a WAV file: ""aplay -D hw:0,2 myfile.wav"" or possibly ""aplay -D plughw:0,2 myfile.wav"". If it works your receiver should indicate it's getting PCM data.
If that doesn't work, look for entries listed as ""digital audio playback"" in the output of ""cat /proc/asound/devices"". Note the numbers in brackets (""[0- 2]"" should be one of them; that's the one we tried in Step 3 with the ""hw:0,2"" parameter). If there are other entries, repeat Step 3 with each parameter.
If it still doesn't work, return to Step 2 and play with mixer settings.
Once you get it working, you can grab a DTS WAV file from this link to test that digital pass-through is working on your card -- be sure to substitute in the right hw: numbers that you got to work earlier: ""aplay -D hw:0,2 Norrlanda.wav"". If it works, your receiver should indicate it's getting DTS data."