Bach 1825 Trombone Mouthpiece Visualizer The Embouchure visualizer is designed for teachers to start a player off with the correct embouchure from the beginning Every brass instrument teacher should use a visualizer to help set a pupil's embouchure correctly during the very first lesson It shows at a glance when the mouthpiece is too high or too low on the lips, whether the lower jaw recedes, whether the tongue protrudes during the attack, and many other embouchure faults For trombone an euphonium Every brass instrument teacher should use a visualizer to help set a pupil's embouchure correctly during the very first lesson It shows at a glance when the mouthpiece is too high or too low on the lips, whether the lower jaw recedes, whether the tongue protrudes during the attack, and many other embouchure faults