Think of it as using the back of your mouth and your tongue to shoot a round jet of air through your lips. Usually takes a lot of fiddling around and trying slightly new positions before you can get a shadow of a note, but then you have something to hone into. Whistling different notes requires you to change how big the inside of your mouth is and how large the hole at the front is. The larger your mouth, the lower the resonant note, and the smaller your mouth the higher the note will resonate. Lower notes are easier to hit, but you can only go so low. There is no real limit to how high you can learn to go.
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