#!/bin/sh
head -c 4 /dev/urandom | \
   hexdump -v -e '/1 "%u\n"' | \
   awk '{ split("0,3,5,6,7,10,12",a,","); \
   for (i = 0; i < 1; i+= 0.00011) \
   printf("%08X\n", 40*sin(450*exp((a[$1 % 8]/12)*log(2))*i)) }' | \
   xxd -r -p | \
   aplay -c 2 -f S16_LE -r 48000 -Dplug:hdmi1