sound issue

I bought and installed the Ferarri pack today and was really hyped to do some hotlapping with the F2004 and the SF70-H. Unfortunately the engine sounds are not working. If i drive on a track the surface sounds of the kerbs and stuff like that are there but the engine is completely silent :(...

Does anyone know who the author is of this Corvette C3 (picture attached). If I switch the camera to outside the sound disappears. The sound is only inside the cockpit. The car is from Assetto database (assetto-db)