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Increasing input mic volume using 'Audio device setting' in Raspberry pi

Hi, I wonder how to increase input volume of MIC.

Currently, recording works. But the sound is too small. I guess it's a problem of gain of MIC. So I tried to adjust the gain by controlling the settings from 'Audio device settings'

However, There were so many settings on 'device setting'. Which button should I select to adjust gain? (I've attached image) If I'm doing wrong, please let me know the way of increasing input volume.

 

Best regards,

J.yoo

from Korea

 

 

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