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===Testing audio input / microphone input from CLI===We can test the default audio input device, or the only audio input device on a simplistic configuration arecord -vvv -f dat /dev/nullWatch 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/nullTo figure out what audio input device is at hw: card,device use the following command arecord -lThe output look for "Card X" and on the same line "device X" to know the card,device combination to specify.