By the way. I tried supporting as it's shown in the video. It gets distorted. Like I'm pushing too much. When I do it like I do in the video it seems like I'm supporting pretty well any other tips?
Vowel modifications help to prevent the notes from breaking up as you begin to get higher. Support and modifications come more and more into play as you begin to get up to your limitations of range.
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https://www.youtube.com/watch?v=Wv3T-xA28fE&t=13s