very quick problem!

[SLAMnesia]

I have a zombie/pathnode script set up. I just made it and its pretty simple but I have one problema.
I don't want the zombie to be active before the player hits the area that triggers pathnodes, in other words; Before I move into the area that triggers the zombie to walk on pathnodes, the "a zombie is nearby" music starts playing and that gives the scare away :\ How do I make it so there is no music (or the zombie isn't active) until I get into the script area?
here's my script so far:

AddEntityCollideCallback("Player", "zareaactivate", "ZombieWalk", true, 1);

void ZombieWalk(string &in asParent, string &in asChild, int alState)
{
SetEntityActive("grunt1", true);
AddEnemyPatrolNode("grunt1", "path1", 1, "");
AddEnemyPatrolNode("grunt1", "path2", 1, "");
AddEnemyPatrolNode("grunt1", "path3", 1, "");
}