Silent Brass exercise damper for euphonium. New model; even smaller and lighter. Brass Resonance Modeling for a true-to-life representation of the euphonium sound through the headphones. Silent Brass is Yamaha's practice damper. very quiet for the outside world. With the help of the damper and accompanying Personal Studio, the produced sound is amplified, so that the player himself experiences the full-fledged sound through the earbuds. Volume can be set itself.