Connect a microphone, music player, or other audio device to your computer
You can use the line-in connection on your sound card to connect a portable music player, microphone, or other audio input device to your computer.
Most sound cards have at least one line-out port to connect speakers and a line-in port where you can connect an audio input device.
However, the line-in connection to your sound card is muted by default. This means that if you plug an audio device into this port, it will not produce any sound on your computer until you enable sound for the line-in connection.
To enable sound for the line-in connection
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Öffnen Sie Audiogeräte und Soundschemas, indem Sie auf die Schaltfläche Start klicken 
, auf Systemsteuerung klicken, auf Hardware und Sound klicken und dann auf Sound klicken.
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Click the Playback tab, click Speakers, and then click Properties.
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Click the Levels tab, and then, under Line In, click the Mute
button 
to enable sound for the line-in connection.
The line-in connection is muted by default
