So I made this lambo hurcane sound mod it’s mono and a wav file but when I put it in mod loader it won’t work the game switches back to its original sound.
Link for the mod I created
I downloaded the mod and tried it in my GTA, it didn't work either.
I checked some sounds on Audacity and they looked fine, so I thought that the only problem could have been that you selected the wrong .wav type, and it looks like I was right. I exported the revving sound as a Microsoft PCM WAV and it works just fine now, apart from having a low volume.
You see, there are two WAV types (at least as exporting options in Audacity), one being the Microsoft PCM WAV and the other being GSM 6.10 WAV for mobile devices. In order to get the sounds to work, you must export the sounds as Microsoft PCM WAVs, and you could also amplify them a bit.
That was most likely the issue. I checked the sound on a rush. Hope this helps.