Echo Cornets have a fourth valve diverting the air to an echo chamber. The echo cornet has a mute chamber (or echo chamber) mounted to the side acting as a second bell when the fourth valve is pressed. The second bell has a sound similar to that of a Harmon Mute and is typically used to play echo phrases, whereupon the player imitates the sound from the primary bell using the echo chamber. There are pieces written sprecifically with the Echo Cornet in mind, the most famous being Alpine Echoes by Windsor. We have had until recently some Besson Echo Cornets that were produced as a limited run of 100 in 1994/1995. Now all sold.