As a clarinet student, i have always been told two things: 1.) to change your loudness, change the amount of air you send through the horn, not the speed at which you send air through it. if you change the speed, you will change the pitch. 1.) you can change your pitch by tightening or loosening your embochure (the way your mouth grasps the mouthpiece) after learning about sound in physics, im a bit confused about wuts going on. if you blow air faster through the horn, do you increase the speed of sound since the medium through which it is propogating is in motion as well? since the area of the opening of the mouthpiece doesnt change, to "send more air through the horn," wouldnt you HAVE to increase the speed of the air? how does the embochure effect the speed of the air?