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HOW TO WORK YOUR YELPER
The wingbone call is used by sucking air through the call with puckered lips and letting air escape at desired intervals. There's no question that it takes practice to master the wingbone, but what better way to satisfy the anticipation of the hunt than to drive your family to madness by smacking your lips against a handful of dried turkey bones? Hand position on the call is key. Place the larger end of the call at the top of your palm between your index finger and thumb. Put the top of your other palm onto the bottom of your pinkie. Bring your lower thumb up and curl your top pointer-finger down to the base of the thumb with the rest of your fingers following in suit one atop the other. Tighten your hands into a cupped position. You can then use your cupped hands to direct and control the airflow.
Sound is made by the vibration of your lips when you suck air out of the call. It will be hard at first, but as you smack your lips against the call it will begin to make sounds. When your lips are good and sore and you're hearing sounds that are "sort of" like a turkey, it's time to move on to the next step, which is working on the tone.
Begin by trying to make sustained notes. They probably won't sound much like a turkey's at this point but they'll help you learn how to maintain a steady note. After that requisite is mastered, the fun really starts-it's time to try shattering window with high notes and making the floor shake with low notes. Developing a wide span of sounds will help you pinpoint the turkey's tones within that range.
Finally, learn to use your throat instead of smacking your lips on the call. This technique helps to keep the sounds constant, while you do a long series of notes. Remember that volume is controlled by the amount of air that is sucked through, while pitch is controlled by the tightness of your lips. Eventually it will all come together, and squeaks and squawks will turn into yelps and putts.