This simple resourcepack makes the firefly bush idle sounds 50x louder.
The pack may appear as "outdated" in-game, but you can safely ignore this warning, it must work with 1.21.8 or older versions.
Installation:
3. Launch Minecraft and enable it in options/resourcepacks.
Editing: You can easily edit this number with 7Zip (or any other zip-tool) and with any text-editor (e.g. Notepad++); firstly extract the .zip, go to assets/minecraft/sounds.json, then simply overwrite the number after '"volume":' to whatever you like. This will multiply the sound by this number.
If you set up a high number but the sound remains silent, try turning the master volume in options/music & sounds/master volume or the ambient sounds at music & sounds/ambient, environment.
I use this setup:

Author: _kkstj_
2025-08-28