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Posted by CJ on 10/1/2021, 7:00 am, in reply to "Help!
Blowing fast air downward will produce higher sounds. Smaller aperture is the ticket. Perhaps have them blow through a coffee straw at a slightly downward angle, place mouthpiece on embouchure, then remove coffee straw and have them maintain the aperture size. Another weird tool, have them buzz through the shank side of their mouthpiece, this also forces them to use a smaller aperture. Hope this helps.