RE: diaphragm calls.
For some people, mouth calls come easy, and for others they are difficult. Fortunately they come easy to me. I prefer the triple reeds. Simp, the call your talking about may be the Diamond Cutter or one of the Team Primos Signature Series. I have a gray Diamond Cutter.I have several Primos calls including the triple A-Frame, the piggyback triple, and several of the diamond series. The E-Z series by H.S. Strut (E-Z rasp, E-Z cutter) are easy to use and sound very good.