Is a very light weigth Addon (3kB Code) + ~20kB Sound File
Only works on paladin characters!
This Addon play sound only ONE time after reached the 3 Holy Power. If you have the prot talent "Eternal Glory", it will play 2 times because you :
1 : use Holy Power
2 : re-get 3 Holy Power
No ingame configuration at the moment.
Copy the HolyPowerNotifyFanUpdate.zip content into "Interface\Addons" folder and select "extract here".
I do not take the credit of the addon, just take the original http://www.wowinterface.com/downloads/info18488-HolyPowerNotify.html#info
and make the change suggested by http://www.wowinterface.com/forums/member.php?userid=266588. I also change the voice sound more "feminine."