Author: Ken Lagace
Date: 2019-11-13 20:09
It is not a 'shriek' you are getting but an 'overtone' of low 'C'. There are no shrieks or squeaks on a clarinet, they are uncontrolled overtones.
All of the overtone eriess in acoustics are Octave, twice the vibration speed of the root, an Octave and a half, 3 times the root, 2 octaves, 4 times the root, etc, etc, etc.
However the unique sound of the clarinet is produced by skipping every other overtone. So for low 'C' the overtones are G, E, A, etc. The register key triggers the G and the lifted left index triggers high E (most of the time). But you are getting the next overtone above the 'E', altissimo 'A', because of an improper embouchure.
Congratulations, you are playing the upper reaches of the clarinet already. Good job!.
Now, how to control it;
In simple terms, the embouchure needs less jaw 'bite' and more side muscle pressure, like whistling. Also there air speed and inner mouth shape 'voicing' skills to learn about.
There are many excellent links on this site about embouchure that you should investigate.
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The Clarinet BBoard
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