alsamixer -V capture #unmute with the m key; enable capture on the chosen control by pressing the spacebar and the word "capture" will appear in the controlamixer -v post output here; this is your alsa-util versionamixer contents |grep -A 11 "Capture Source" post output here; this command lists all controls that can be captured(recorded)amixer contents |grep -A 4 "Mic" post output here; this command lists the Mic settingsarecord -f S16_LE -c2 -r48000 -d 5 test.wav; aplay test.wav #talk into mic for 5 seconds or play as sound file during recording