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Step 1
Place the diaphragm on your tongue with the curved end on the "horseshoe" towards the rear of your mouth. Raise your tongue up until the call fits tightly against the roof of your mouth. Try different sized calls to find a comfortable fit.
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Step 2
Hold the call tight to the roof of your mouth with your tongue and make a hissing sound. Make sure that all of the air passes between your tongue and the roof of your mouth, with no leakage around the sides. If done correctly, you will make a high-pitched squealing sound.
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Step 3
Vary the pitch of the squealing sound by applying more or less pressure on the roof of your mouth with your tongue. The pitch will go higher with more pressure and lower with less pressure.
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Step 4
Make a "cluck" by popping your lips while expelling air. Try to say the word "pluck" while popping you lips. Tone and volume is affected by the amount of air you expel and how quickly you pop your lips. To "pop" your lips, rapidly open and close your lips, letting a small amount of air pass over the call.
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Step 5
Make a "yelp" by combining a high note with a low note. Make a high-pitched sound by applying pressure with your tongue, then ease the pressure and let the pitch drop. Move your jaw slightly to relax pressure on the diaphragm. Try saying the word "chalk" to create a yelp. Start slowly and then increase your speed until you achieve a high-to-low yelp sound.
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Step 6
Make a "purr" sound by making the diaphragm's reeds vibrate. Try to make a purring sound with your vocal chords without actually making an audible sound. This will cause the reeds to vibrate and make a purring sound.
