The most reliable way to remove a sound pack is to let your game launcher detect the "corrupted" (modified) files and download the originals.
To remove a sound pack from FiveM and restore the original audio, you must replace the modified sound files in your with the original game files . Because sound packs usually overwrite the core .rpf files, simply deleting them will cause the game to crash or fail to load. How to Revert to Original Sounds Fivem - How to Remove Sound Pack
Most FiveM sound packs are installed by replacing files in the main GTA V directory rather than the FiveM application data folder. FiveM draws its base audio assets from the local GTA V installation, so cleaning the FiveM cache will not remove a sound pack. The most reliable way to remove a sound
If you know which files were replaced (often resident.rpf or weapons_player.rpf ), navigate to your GTA V/x64/audio/sfx folder, delete those specific files, and then run the Verify Integrity check mentioned in Step 1. The launcher will only download the missing files. Why this happens How to Revert to Original Sounds Most FiveM