Bach 1826 Embouchure Visualizer for Both Trumpet and Trombone;

Embouchure Visualizer for Trombone mouthpiece 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.