Siren audio in vehicle

I am working on an addon vehicle that is based on the base gta ‘firetruk’ model. I copied all of the vehicles.meta, carcols.meta, carvariations.meta from base gta and changed everything over to firetruk2 (referencing firetruk in handling, etc, where needed). However, when the sirens come on for the vehicle, it’s different than the firetruk siren, and the horn doesn’t use the firetruk horn. I cannot figure out how to change it or what to change. I checked the

and in carvariations.meta, and they match the firetruk, yet when I turn on the lights, the sound is different than the firetruk. The lights are the same, but the audio that goes with the lights (siren) is different than the firetruk. The horn is as well.