How do I let a sound play ONLY inside an area?

[i3670]

AddEntityCollideCallback("Player", "AmbienceArea", "MyFunc", false, 0);

void MyFunc(string &in asParent, string &in asChild, int alState)
{
{
if (alState == 1)
{

}
if(alState == -1)
{


}
}
}

When he enters, 1, one type of sounds played and when he leaves, -1 another sound is played.

EDIT: This however does require that you cover the entire area with a single script area.