Notes on Sound and Audio
This turns off and on the master volume switch in Linux from the command-line. This is useful for scripting.
amixer sset Master off amixer sset Master on
Play raw audio -- make noise
This shows how to play a raw audio byte stream of 44.1 kHz, 16-bit, single channel, unsigned integer. In this example the file, entropy-source.bin, is a binary file of random bytes. Since this is noise it hardly matters how fast the data is played back.
play -t raw -r 44100 -b 16 -c 1 -e unsigned-integer entropy-source.bin play -t raw -r 44100 -b 16 -c 1 -e unsigned-integer /dev/urandom
This gives playback at a lower sample bitrate and sample bit size, 8 kHz, 8-bit, single channel, unsigned integer. This plays the binary from the play binary itself.
play -t raw -r 8000 -b 8 -c 1 -e unsigned-integer $(type -p play)