Thank you Lucknow. I can get the idea about sound parameters.
By the way,
soundGetIn[]={"Vehicles\get_in",0.000316,1};
soundGetOut[]={"Vehicles\get_out",0.000316,1};
These are the sound difinitions about "get in" and "get out". You see, sound travel parameter is 0.000316. I think 0.0003 is enough. Why do they difine such a halfway value 0.000316?