@wakka
so u're saying just by selecting audio in, the computer will automatically start recording the voice of the instructor without a microphone? It will record the inbuilt sound like clicking, double clicking or play a music, all will be recorded. But how's the instructor voice going to record? Think bro.. Just don't give people useless suggestion. He wants to be able to hear what the instructor says along with the video, how do you think the computer will record his voice without a microphone?
I've used it more than you...