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From IGEP - ISEE Wiki
→Get sound in (audio in)
External Audio input devices, such as a powered microphone or the audio output of a PC or MP3 player, can be connected to the via a 3.5mm jack (Audio IN).
You can record audio in with the application Arecordarecord, for example:
$ arecord -t wav -c 2 -r 44100 -f S16_LE -v audio-in.wav
