If you don't ever practice low to the point of fatigue, you will
probably notice that when you do, your embouchure will feel very tired
in places that it normally doesn't. This suggests that playing low
exercises muscles that normally are not exercised. Strengthening these
muscles has to have a good effect on playing high; the strengthened
muscles ought to provide more support for your current high chops.
You can bombard your low chops effectively by practicing Kopprasch and
others one octave down. As I may have metaphored here long ago, playing
rapid 16th notes in the lower register is a little like hiking through
deep mud. Good exercise.
--
{ David Goldberg: [EMAIL PROTECTED] }
{ Math Dept, Washtenaw Community College }
{ Ann Arbor Michigan }
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