I try to record capture from all channels of all devices (each channel in a separate file) using arecord . I execute the following command in the console:

 arecord -C -d 10 -D plughw:0,0 -c 2 -f cd --separate-channels c1.wav c2.wav 

Question: how to set the search on all devices and increase the number of channels from which to read? Now more than two channels to read does not.

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