How to Hand Whistle

Links:

RTR Guide to Whistling Blowing - How to Whistle With Two Hands - Great explanation with lots of helpful tips and pictures. but I find his form to be dreadful if you want to use Hand Whistling as an instrument.
ViewDo: How to Two Hand Whistle - Short and sweet with an acceptable form.
WikiHow - How To Make an Ocarina with Your Hands - Great form, but ignorant and confusing explanation.

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