This WA adds a simple holy power tracker with audio cues. You can edit the audio cues by editing "HP-03" and "HP-05".
I use this Addon for additional sounds:
https://www.curseforge.com/wow/addons/sharedmedia-retro-game-sounds-vo
https://www.curseforge.com/wow/addons/sharedmedia-retro-game-sounds-v2