archery1,
Zink Calls has a DVD called, " Turkey Time University 1". In that DVD they go over the proper mechanics of using a mouth call such as, tongue placement, air pressure and how to get the air to come from your diaphragm. There are animated pictures showing the mouth and tongue working while Shane and Josh are calling. They break it down very slowly and go over one call at a time. Very easy to follow and understand. There is no guess work on what they are doing or what they mean. You can get the DVD for $10 on there website. Best instructional I have ever seen.