Arecord alsa audio input testing

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We can test the default audio input device, or the only audio input device on a simplistic configuration 

arecord -vvv -f dat /dev/null

Watch while the audio input levels are displayed as a percentage.

We can specify an audio input device 

arecord -vvv --device="hw:1,0" -f dat /dev/null

You can display a list of CAPTURE Hardware Devices. To figure out what audio input device is at hw: card,device use the following command 

arecord -l

The output look for "Card X" and on the same line "device X" to know the card,device combination to specify.

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