I just received my diaphrams from Denny himself last week. Denny told me that you have to " huff" air out straight from your diaphram just like a turkey. They operate different because they are built different, layered and rippled and no fancy cuts. Try saying the word HUCK instead of CHUCK. I' m still becoming proficient with them but the yelps are incredible and realistic when compared to real wild hens in my video library. I like the volume control on these diaphrams too. I like the soft talk that I can control a little easier. Denny told me that if I was having problems to give him a ring and he would personally get me on track. That' s why his # is on every product. Stand up service in my opinion. Give him a ring.