When a creeper is about to explode the sound will be: "Creeper?"
And when it exploded: "Aw Man!"
How to control in game volume:
- Creeper? ---> Hostile Creatures
- Aw Man! ---> Blocks
Side effects of this resource pack:
- other explosions like end crystals and TNT will also have their sound changed
- the explosion sound isn't perfect because minecraft randomly changes the sound pitch slightly (or something like that)