During testing today, the device exhibited issues with back pressure. When the solenoid valve is closed during a rest in the music, the air hose pressurizes to its maximum behind the valve. When opened again, a sudden surge of air floods the recorder and produces a loud, undesirable noise. To combat this, wadding was stuffed inside of the 1’’ tubing to reduce the velocity and volume of the air reaching the mouthpiece of the recorder, much like a pop filter is placed in front of a microphone to slow down the air from sharp sounds like “P” and “B”.