 So you follow the states choosing "Tools" -> "LINEIN
Begin" on the menu.  Then a frame, that is to show the spectrum of Line In, appears. Maybe it's
very small.  You need a signal source like "iPod" or some other sound device
to activate Line In.  If you play this sound by iPod and inject it to the PC, the window will be like this. This means
there is a big 1kHz-sine-wave on the sound. 
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