That's great, thanks for that recommendation! By modifying the last parm I get a more pronounced wave in/out sound that works well for me: play -q -c 2 -n

That's great, thanks for that recommendation! By modifying the last parm I get a more pronounced wave in/out sound that works well for me: play -q -c 2 -n synth brownnoise band -n 1600 1500 tremolo .1 75