Sound when see gamect? need help

Hey,

I'didnt find such a answer and I need help.. I want to write a horror game and i need some special FX.. My Problem: There's a long room with some lights and a chair, there is a table at the and and a taclight.. so when i took the taclight, and turn around i want so have a sound, because on the chair is a puppet.. I tried with Renderer.becomevisible but that don't works, it plays too when i don't see the puppet, that waits behind the wall.. and sorry for some mistakes, i'm from germany and don't speak english well :p thanks