Author: kdk ★2017
Date: 2019-05-10 21:11
Did you or she measure the speed/forward velocity of the air as it entered the mouthpiece? What was the velocity when you played loud? What was it when you played softly? I doubt if you know either answer.
Keeping the reed's stiffness and your embouchure constant, if you blow harder so that more air passes by the reed, it comes out louder - until you just force the reed closed. Blow less air and it comes out softer. There is a discussion to be had about the way you control the air flow at whatever volume is involved, but I don't myself believe that it has to do with air velocity. "Fast air" IMO is a term wind players have made up to describe a process that is, I think, more subtle. If "fast air" means something to you, I suppose it may be a useful idea, but it has serious limitations.
There is also discussion possible (though, I think not much) about whether or not "high volume" (I assume you mean loud) is necessarily in itself a valid goal. Your first teacher was right that beyond a certain point of loudness, a clarinet can go out of control, lose focus and become coarse-sounding. Beneath a certain point of softness, the sound, if not well controlled, can become breathy, thin and unsubstantial.
Controlling the differences between coarse and fortissimo or thin and pianissimo is part of good technique and depends on your ears to determine which is coming out of your clarinet.
What this new teacher did was perhaps to expand your range of possibilities. But you need to be the judge of your own playing.
Karl
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