It sounds like you're looking for a review of by Jeff Smiley (often circulated as a PDF). Here’s an honest, detailed review based on what brass players (trumpet, in particular) commonly report about this method.
The Balanced Embouchure by Jeff Smiley is a dynamic range-of-motion method designed to strengthen and increase the flexibility of brass players' embouchures through specific lip-positioning exercises. The approach, detailed in his 2001 book, challenges traditional methods by emphasizing a balanced,, adaptable, and "extreme" range-of-motion training rather than a static lip position. For more information on the method and the book, visit trumpetteacher.net balanced-embouchure.eu The Balanced Embouchure - Europe the balanced embouchure jeff smileypdf work
Learning to rely on muscle coordination rather than jamming the mouthpiece against the lips. "The Balanced Embouchue" It sounds like you're looking
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