This seems strange: $ aucat -n -d -i input.wav -c -r 8000 -o out.wav input.wav: skipped unknown chunk input.wav: play, chan 0:3, 48000Hz, s16le, bytes 80..1920080, vol 8388608 -r: channel range expected
It is an ommited number in -c 1 of course, not a missing sample rate. Jan