The easiest way to do this is through the Linux console.  The GUI is a bit flakey when it comes to sound.

Find the card number :-

  • cat /proc/asound/cards

Turning up the microphone knob :-

  • amixer -c 1 set Mic 32 Replace the 1 with your card number !!

Start recording :-

  • arecord -Dplughw:1,0 -f cd file.wav Replace the 1 with your card number !!
 
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