 This three-valve compensating configuration is still available in British style baritone horns, usually on professional models.A creation unique to the United States was the double-bell euphonium, featuring a second smaller bell in addition to the main one; the player could switch bells for certain passages or even for individual notes by use of an additional valve, operated with the left hand.Ostensibly, the smaller bell was intended to emulate the sound of a trombone (it was cylindrical-bore) and was possibly intended for performance situations in which trombones were not available.