Well I have a little problem with purchasing the inserts. I have never hunted ducks, so when he says a timber, open water, etc, I just don't know what the heck he is talking about. It that a different sound for different kinds of ducks? I know there are mallards, sprigs, teals, etc, but don't know squat about the different sounds they make. I have to make a few duck calls for family members and just don't know what I am suppose to be getting to make them happy. Some insight would be appreciated. Thanks.