Line In
The Line In tab allows you to configure audio input settings using the analog line in port.
To set the analog line in options
1.From the Realtek HD Audio Manager, click the Line In tab.
2.Click Set Default Device to set the analog line in port as the default audio input device.
3.The Line In tab allows you to adjust
the recording and playback volume and set a default format for audio input.
4.Click 
to effect the Line In settings and exit.
Microphone
The Microphone tab allows you to configure the audio input settings using the analog microphone port and to check if your microphone device is connected properly.
To set the Microphone options
1.From the Realtek HD Audio Manager, click the Microphone tab.
2.In the Microphone Effects sub- tab, click the Noise Suppression
option button to reduce the static background noise when recording. Click the Acoustic Echo Cancellation option button to reduce the echo from the front speakers when recording. Click the Beam Forming option button to eliminate surrounding noise interferences.
3.Click the Default Format
4.Click 
to effect the Microphone settings and exit.
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