I’ve tried new mouth calls and known immediately that I’d never use them. Boom—10 bucks down the drain. But since health departments frown upon testing diaphragm calls before you buy them, how do you know what style you need? A mouth call’s sound comes from the reeds. In general, more reeds with more cuts mean more vibration, volume, and rasp. Just about every call maker has some version of these three classic designs. Master them all, and you can call any tom in the woods.