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.

RE: diaphragm calls.
 

I LOVE MY PRIMOS SONIC DOME I THOUGHT IT WAS EASY, BUT THEN IT MIGHT NOT FIT YOUR MOUTH

RE: diaphragm calls.
 

Try the River Valley calls. They are built with a small frame and have the tape cut smaller than most right out of the package. Some people do not have to trim them at all.