Sound

From The World according to Vissie
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Setup

Test

Test Mic

sudo arecord -l
sudo arecord -f S16_LE -d 10 -r 441000 --device="hw:2,0" /tmp/test-mic.wav

CD quality

sudo arecord -D sysdefault:CARD=3 -d 10 -f cd -t wav ./test4.wav
cat /proc/asound/card0/codec#* | grep Codec