Get into a vehicle, hatchback or SUV for instance and try the horn. Without setting your audio effects to absolute 100% you can't even hear it. Makes me wonder whether you guys ever sat in a car and used the horn, trust me, you can hear the horn when you're inside the car IRL.

In general I find that the the audio reduction from 3rd to 1st person or inside/out vehicle is too much, and it doesn't seem like parameters insideSoundCoef and attenuationEffectType are affecting this behaviour at all.

I'm posting this because I'm working on a police vehicle that uses a siren script (using Say3D) and inside you can barely hear the siren while outside the vehicle it's really, really loud. Me and a friend of mine desperately tried to change the attenuation but no cigar.

Related BIS forums threads:
http://forums.bistudio.com/showthread.php?174671-Need-fix-1st-person-vehicle-sound-LOW
http://forums.bistudio.com/showthread.php?191881-Vehicle-Attenuation-amp-Police-Sirens