In the case of a whistle, the sound is created by the upper teeth and tongue forcing air on to the lower lip and teeth. Sweet spot . Once you locate the sweet spot, your whistle will have a strong, clear tone, as opposed to a breathy, low-volume sound.
Repetition is the key to success .
As with any motor skill, muscles learn to coordinate through the repetition of the desired movement. If you need help translating these instructions to your mouth, step in front of a mirror and practice. Vary your hand and mouth positions, noting which position sounds best. Only the outer edges of your lips are visible, if at all. Choose your finger combination The role of fingers is to keep the lips in place over the teeth.