How to change Audio Mic-in default port?

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http://askubuntu.com – My Mic-in port is somehow damaged. I'm not using my Line-in port. SO I want to use my Line-in port as my MIC-in port (Microphone). So that I can continue using skype and other VOIP Apps. If there is any way to reconfigure my port setting Please let me know. OS: Ubuntu 11.10 (HowTos)