запись звука

$ sox -t alsa default recording.flac
$ pacat --record | sox -t raw -r 44100 -s -b 16 -c 2 - -t ao alsa pitch -500
$ lame -b 128 music.mp3 music.wav

crontab -e
40 12 * * * sox -t alsa default /a/sound/$(date +%Y.%m.%d_%H:%M:%S).flac > /dev/null 2>&1
45 12 * * * killall sox