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You will first need to setup ALSA correctly by loading the snd_aloop module and using its named device in an mdev plugin. You will simultaneously output an application's audio through the loop back device and another device of your choice. # ~/.asoundrc pcm.!default { type plug slave.pcm mdev route_policy duplicate } pcm.mdev { type multi ...


I found out what the problem was. The command defaults because I wasn't specifying a 2-channel (stereo) 192kHz audio input. Here's an example of a command that did work: $ arecord -f S24_LE -c 2 -r 192000 -d 20 test.wav The -c 2 is what fixed my commands.

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