Description This call is designed with two small cuts in the latex to create the soft and mellow sounds of a cow. #105 The âPalate Plateâ elk diaphragm call is designed to be placed further forward in your mouth, behind your front teeth, this helps to prevent gagging and gives you easier control of the latex. To operate the call, place the âPalate Plateâ upwards to the roof of your mouth, latex down and open end of the diaphragm towards the front of your mouth.