[kaisersouse]

In OnPlayerKeyStateChange

Код:

if ((newkeys & KEY_CROUCH) && GetPlayerState(playerid) == PLAYER_STATE_DRIVER)
	{
                    new Float:x;
                    new Float:y;
                    new Float:z;
                    GetPlayerPos(playerid,x,y,z);
		    foreach(Player,i)
		    {
			    PlayerPlaySound(i,3200,x,y,z); //play sound for everyone, but only at horn users pos
	  	    }
	}

You don't need an MP3. Airhorn is in-game sound