Noise generator
speaker-test -c2 -t sine -f 440 and https://www.szynalski.com/tone-generator/ and pacat
Pong-!-“Noise generator”
Pong-!-Quack
Register or Login to play your own verbal Ping-!-Pong.
sudo cat /dev/urandom | padsp tee /dev/audio > /dev/null