AMIUHOUN Trumpet Pressure Control Valve Trainer Trumpet Mouthpiece Correction Aid Professional Correction Assistant Tool Easy Installation Easy to Use Gold

4. Beginner exercise, adjustable spring strength; the task of the pressure reducing valve is to control the pressure of blowing. The practitioner must set the right vibration to achieve a natural playing effect, the best to improve the sound. 2. Professional breathing exercise, adjustable pressure. 3. Gold plated, brass, trumpet mouthpiece pressure reducing valve, very good air density, adjustable to accurately adjust the direction of movement of the lip muscles and endurance. 1. Trumpet mouthpiece decompression valve, corrective blowing, beginner exercises, improve tone. 5. and sensitivity, reduce the pressure of the mouthpiece, the pressure of the mouthpiece is reinforced to a certain extent, which is compressed, no hair noise, only when relaxed you can blow a normal sound.