Previous helicopter sound mods replaced the blades sound files. These files are split in milliseconds and played randomly, which makes modding very difficult. I decided to replace the engine sound files (which are loops that last for a second), crank the volume up, and silence the blades sound. It worked out quite well, at the cost of having a very tedious installation and maintenance.
Replaces every helicopter sounds (including Avenger) with more realistic sounds.
Blade sounds will be super loud when you are changing a radio station
You have to replace every sound data files which defines the sound of the helicopter. Detailed instructions are included in the .zip.
Added FiveM version (Credits to ozzysunn)
Changed Cargobob sounds
Added OIV Installer (Credits to Niziul)
Fixed Annihilator Stealth sounds