Dead End Game Calls Mouth Diaphragm – Signature Series This turkey mouth call is designed by Matthew Presley , 3× National Champion and World Champion turkey caller. Built as a three-reed diaphragm , it delivers a clear, crisp front-end yelp while requiring very little air , making it easy to run and highly controllable. Extremely versatile, this call is capable of producing the entire range of turkey vocalizations , from soft, subtle calling to aggressive yelps when it’s time to fire up a gobbler. A proven, competition-designed call built for real-world hunting success.