BERP Number 4 for Small Trombone or Euphonium.
Simply put, The Berp is the most efficient tool you can use to help yourself become a better brass player. It helps you develop proper breath support by blowing into resistance, letting you buzz your mouthpiece while you hold your instrument in the regular playing position. The Berp also lets you press your instrument’s valves or move the slide to match the pitches you’re buzzing, so you gain ear-training benefits through reinforcing the connection between buzzing the mouthpiece and playing.