audio notes
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Record audio from the microphone
arecord -vv -fdat recording.wav
Using Sox (this works on OS X). This splits on silent gaps:
rec -r 44100 -b 16 -s -p silence 1 0.50 0.1% 1 10:00 0.1% \ | sox -p audio_recording.wav silence 1 0.50 0.1% 1 2.0 0.1% : newfile : restart