/etc/udev.rules/00-bling.rules:
RUN+="/etc/udev/sounds/hw.sh"
/etc/udev/sounds/hw.sh:
#!/bin/bash
#logger -t "hw.sh" "$(whoami) Sounding '${ACTION}' for '${SUBSYSTEM}'"
add="/etc/udev/sounds/hw_insert.wav"
rem="/etc/udev/sounds/hw_remove.wav"
[ "${SUBSYSTEM}" == "usb" ] || exit 0
case "${ACTION}" in
add) snd="${add}" ;;
remove) snd="${rem}" ;;
*) ;;
esac
[ "${snd}" ] && /usr/bin/aplay -q "${snd}" &
Note that aplay likely won't work if you have a sound manager like esd squatting on the sound devices, so set it to give them up after a while.
Also, sound managers like esd won't work because they disallow connections from sources that don't match credentials
Salt and pepper to taste...