No Tone, rushing air.

Cause:  Embouchure not formed tightly enough, lips spread.

Remedy:  Re-form embouchure, "Oh-OO SQUEEZE", grip tube more firmly.

Cause:  Air Stream restricted, closed throat, high tongue.

Remedy:  Emphasize "OH" to open throat, keep tongue down.

Thin, pinched tone

Cause:  Cmbouchure formed too tightly, lips pinched.

Remedy:  Loosed grip on the "tube"

Cause:  Insufficient volume of air passing etween lips.

Remedy:  Review deep breath and fast expulsion of air.

Gargled Tone

Cause:  Embouchure not formed tightly enough.

Remedy:  Grip the 'tube' more firmly.

Cause:  Lips folding over teeth.

Remedy:  Re-form embouchure, "OH OO SQUEEZE" use ring to check lip position.

Stopped or intense air

Cause: Lips pinched completely together

Remedy:  De-emphasize gripping tube, reform "OH-OO".

Cause:  Insufficient volume of air passing between lips.

Remedy:  Review tongue position (OH) and fast air.