Start recording audio from hw:2,1,4: $ arecord -D hw:2,1,4 -f S16_LE -c 2 -r 48000 recorded.wav A simple experiment could demonstrate the same. For example, audio played back into hw:2,0,4 could be captured from hw:2,1,4 audio played back into hw:2,1,7 could be captured from hw:2,0,7 – these are what are the loopbacks. Now in this, whatever audio is played back into hw:2,0,s could be captured from hw:2,1,s and viceversa, s ranging from 0 to 7. Moreover, each of the two devices under it, has 8 subdevices, which would be accessed using the format hw:c,d,s, where c stands for card number, d for device number, and s for subdevice number, e.g. It may vary depending on which is the next free available card number. ![]() In the above images, the card 2 is the loopback card.
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