1. Embouchure not formed tightly enough, lips spread - Reform embouchure, "OH-OO SQUEEZE", grip tube forme firmly

2. Air stream restricted, closed throat, high tongue - Emphasize "OH" to open throat, keep tongue down

1. Embouchure formed too tightly, lips pinched - Loosen grip on the "tube"

2. Insufficient volume of air passing between lips - Review deep dreath and fast expulsion of air

1. Embouchure not formed tightly enough - grip the "tube" more firmly

2. Lips folded over teeth - Reform embouchure, "OH-OO SQUEEZE", use ring to check lip position

1. Lips pinched completely together - De-emphasize gripping tube, reform "OH OO"

2. Insufficient volume of air passing between lips - Review tongue position (OH) and fast air