This is a problem related to pulseaudio. It blocks the second access request to your sound card. You should be able to fix this by doing part A of the following guide: http://ubuntuforums.org/showthread.php?t=789578 It is up to you if you do the rest, but they shouldn't be required to fix the problem.
To be sure that it is the specific problem, I recommend you do something else first. Run the following commands simultaneously, each command in a separate terminal:
Code:
gst-launch-0.10 audiotestsrc ! pulsesink
gst-launch-0.10 audiotestsrc ! alsasink
If you only get sound from one of them, you have the problem, which you can fix by following the earlier mentioned guide.
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