Ubuntu 12.10 can't detect microphone

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http://askubuntu.com – I cant use the microphone in my ubuntu 12.10. I don't know at all what it the reason. My sound settings input tab displays some device, but I am not sure if that is my microphone. I use the skype test call to test if the mic is working but I never hear my voice. Why I can't use my microphone? what is missing? (HowTos)