Adjusting the pressure inside the mouthpiece enclosure is tough because you've got a reed controlling the air flow. Each note has a different resistance to air flow. Also too much pressure and the reed will close completely, not enough and it won't vibrate.
Adjusting the pressure inside the mouthpiece enclosure is tough because you've got a reed controlling the air flow. Each note has a different resistance to air flow. Also too much pressure and the reed will close completely, not enough and it won't vibrate.