[SCRIPT] Script Box help

[liquiddr3amz]

void OnStart()

{
AddEntityCollideCallback("Player", "foot7", "step7", true, 1);

}

void Sound (string &in asParent, string &in asChild, int alState)

{
PlaySoundAtEntity("", "step_walk_wood.snt", "step7", 0.1, true);
}

NOTE; my script area is called foot7
my Sound name is step7

i RE ran the script using a differnt sound, what is happening is sound just gets activated befor i am even close to the script area, any reasons why?