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aplay -f s16_le -r 8000oraplay -f s16_be -r 8000on the output of/dev/ttyUSB1(and similarlyarecordfor the input), I just get noise, also with many other settings toaplayorffmpeg/ffplay.AT^CVOICE?gives0,8000,16,20.aplay --help:Usage: aplay [OPTION]... [FILE].... Similar forarecord. Thee the help foraplayandarecord.