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Vehicle attenuation is the system where people outside and inside of a vehicle hear each other at reduced volumes. The old implementation was to simply use the insideSoundCoef in the vehicle config. This value was used by the game engine to determine the sound level heard internally.

Arma 3 has introduced new config options for sound attenuation that replace the previous system. Every vehicle has a config property attenuationEffectType which references an attenuation effect. Each attenuation effect has its own class in ConfigFile >> CfgSoundEffects >> AttenuationsEffects. We added a new config parameter for these effects to define the attenuation used in ACRE. If a config does not have one defined it uses the acreDefaultAttenuation property. If the value is 1, the sound will be blocked completely and if it is 0 no sound will be absorbed.

Note the system also takes into account the sound effects on a turret using the value of soundAttenuationTurret. There is also the option to disable attenuation on a turret using disableSoundAttenuation = 1;.

The default config is listed below:

class CfgSoundEffects {
    class AttenuationsEffects {
        acreDefaultAttenuation = 0;
        class CarAttenuation {
            acreAttenuation = 0.5;
        };
        class SemiOpenCarAttenuation {
            acreAttenuation = 0;
        };
        class SemiOpenCarAttenuation2 {
            acreAttenuation = 0;
        };
        class OpenCarAttenuation {
            acreAttenuation = 0;
        };
        class TankAttenuation {
            acreAttenuation = 0.6;
        };
        class HeliAttenuation {
            acreAttenuation = 0.6;
        };
        class OpenHeliAttenuation {
            acreAttenuation = 0.1;
        };
        class SemiOpenHeliAttenuation {
            acreAttenuation = 0.4;
        };
        class HeliAttenuationGunner {
            acreAttenuation = 0.15;
        };
        class HeliAttenuationRamp {
            acreAttenuation = 0.15;
        };
        class PlaneAttenuation {
            acreAttenuation = 0.6;
        };
        class RHS_CarAttenuation {
            acreAttenuation = 0.5;
        };
        class CUP_UAZ_CarAttenuation {
            acreAttenuation = 0;
        };
        class CUP_Ural_CarAttenuation {
            acreAttenuation = 0;
        };
    };
};