Exercise damper
Practice dampers are a system for silently practicing wind instruments . It works like a normal damper .
The practice mute is in the bell put the instrument intercepts the played sound almost 100% on. This is forwarded to headphones via an electronic device. This enables practically silent practice of various wind instruments. The remaining volume is reduced so much that nothing can be heard in the next room when the door is closed.
Are spreading the practice mute Silent Brass of musical instruments - manufacturer Yamaha , but in addition, there are also many other exercise damper systems.