The call industry has been marketed the very same way as any other , advertising!
Apperantly unless you use a particular call - surprisingly used by the TV personality that is being fearured, you will not be able to call a duck, goose, elk, deer , or whatever else you are trying to lure in!
Calling stuff is not rocket science, and it's not complicated , however we have been conditioned over the years to think it is!
Over calling any mcritter is about the most common mistake made, and also calling where the crtters are not.
Garb a call, listen to the birds and have fun with it!
Cat