But i'm not really sure if this kind of "cheat" is all about sound effects. Yes, the survivor player in the other team heard a typical sound when we spawned as a hunter/smoker/whatever in ghost mode (Hunter is screaming, jockey is laughing and what not), but i think, it was a kind of "info" for him as what we will spawn when leaving the ghost mode and we heard it all over all talk on. It gives the survivors team an advantage when they know in what we will spawn after leaving the ghost state. My suggestion was to block these info so that their "cheat" doesn't recognize, in what a kind of special infected we would spawn. Hope, it makes it more clear.
But yes, i have to admit it could be the wrong hook for, or it is even not disableable by a script.