The Berp is a tool designed to support proper airflow control when playing wind instruments. It allows you to add resistance while blowing into the mouthpiece, making it easier to produce sound while maintaining the instrument in the correct playing position. With the Berp, you can press the instrument's valves or move the tubing to match the notes you are producing, thereby enhancing the connection between the mouthpiece sound and your playing, as well as providing benefits for ear training.