I cant help you on this one, i mainly stick to slate, crystall and glass calls. I love em'..dont get me wrong, i do use a diaphragm. Ialways keep one in my mouth when hunting for when that big tom comes up close and u cant move a muscle. But as far as explainin how to do..me not being that good at it myself, i cant..sorry. If you got the basic calls down, keep workin with it and u shoud get good at the others