Recording and playback on Linux

Record in monaural

$ arecord -t wav -d 5 mono.wav
Recording WAVE'mono.wav' : Unsigned 8 bit,Rate 8000 Hz,monaural

Play recording

$ aplay mono.wav 
Playing WAVE'mono.wav' : Unsigned 8 bit,Rate 8000 Hz,monaural

Record in stereo

$ arecord -t wav -d 5 -c 2 stereo.wav
Recording WAVE'stereo.wav' : Unsigned 8 bit,Rate 8000 Hz,stereo

Play recording

$ aplay stereo.wav 
Playing WAVE'stereo.wav' : Unsigned 8 bit,Rate 8000 Hz,stereo

Confirmed on Ubuntu 20.04.

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