This is a blended siren that is commonly run on Fire vehicles in the United States, It has a Federal Q winding with a powercall, hyper yelp and warble running as well. Enjoy! Goes great with the KME Predator.
Simply open the .truck file of the vehicle you wish to add siren to and see what the existing file is named, then rename the federal Q powercall to that of the existing file and replace the existing .wav file in the vehicle folder. (see thumbnail if need be)