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When ever you think you want to stop recording just press CTRL+C
== Get microphone in (audio in) ==
Connect an external microphone in the MIC-N connector.
Enable for the input microphone:
$ amixer -c 0 sset 'Right PGA Mixer Mic3R' on
$ amixer -c 0 sset 'Left PGA Mixer Mic3L' on
$ amixer -c 0 sset 'Right PGA Mixer Line1R' off
$ amixer -c 0 sset 'Left PGA Mixer Line1L' off
You can record microphone in with the application arecord, for example:
$ arecord -t wav -c 2 -r 44100 -f S16_LE -v audio-in.wav
== Install firmware in eMMC ==