So following problem. I use the normal sirens or the LAPD Smart Siren _2016_ Vehicles_ 3.0 pack and everything is fine. But I'd like to have a rumbler siren. So I download Realistic american sirens or united states siren mega pack 1.6.1.

The files that I'am replacing have the same name and I do it the same way. But ingame I dont have sounds. Does ESL need some compatible sound packs? I just don't get it why its not working :( 

You need to make sure that the "vehicles.oac" folder is not more than 15.7MB, otherwise it will get muted.

THX! do you have an Idea how to get the audio files smaller?

On 5/15/2017 at 1:15 PM, emb306 said:

THX! do you have an Idea how to get the audio files smaller?

Click Edit, Open, choose the file to compress and click OK. Click Project Rate and choose a lower value. Click the drop down arrow next to name of the audio file and select Split Stereo Track, select Mono by clicking on the drop down next to the two tracks.

If you are using Audcity.