I put this in the file /etc/init.d/bootmisc.sh (at the end, before ": exit 0") to get sound working in et, without having to run it as root. Putting it in this file just makes sure that it's run when the computer boots, otherwise you'd need to run that command in a terminal as root (not just with sudo) each time you reboot. 
 
Code:
#sound for et
echo "et.x86 0 0 direct" > /proc/asound/card0/pcm0p/oss