How To: Set up sound output & input in Mac OS

Gary Rosenzweig of MacMost is describing how we can use sound input and output controls on one's Mac computer. He mentions of the availability of multiple input and output devices like built-in mic; line-in etc and speakers , USB headset and provides a detailed information of using each of it; by selecting the one the user requires. He shows how the user can use popular communicating tool the Skype with the Mac laptop. One must go through this video to understand the selection of the output or the input devices.