Sound

Test Video

vlc v4l2:///dev/video0

Test Audio

arecord -d 10 /tmp/test-mic.wav

this will record 10 seconds.

Play test-mic.wav Now it is easy to play your wav file with another simple alsa utility a play:

aplay /tmp/test-mic.wav

NOTE: If you have a more sound devices on your system and you need to use the non default sound card you can specify it to arecord with -D option. For example:

$ arecord hw:1,0 -d 10 /tmp/test-mic.wav

Audio Mixer

ardour

apt install ardour