From the stories I hear here in Cajun country, it's a wonder the old timers bothered with calls at all. Maybe a diversion to take the warden's mind off the corn. I know effective callers who mostly use trashy calling from calls with a lot of squeal, like Haydel's dirty rice, but I'm more confident of getting reflex response from disinterested appearing birds with clean, crisp calling. When I get trashy, I've already got 'em by the bill and am amusing myself and, perhaps, my guests.
If you think I'm wrong, you might be right.