This is a Jazzophone, an instrument that plays like a trumpet, but is shaped like a saxophone and has two bells, one standard trumpet bell with standard trumpet fingerings, and another bell which is permanently muted, with a paddle which can be actuated to further dampen the sound. The gentleman who commissioned this horn requested that it be fitted with an additional valve. Due to the complicated nature of playing this instrument, throwing slides is not practical, so the horn was fitted with a valve to help correct errant intonation. Two thumb triggers actuate both this valve as well as a change valve which instantly changes between the two bells, and a pinky paddle controls the "wa-wa" effect attached to the muted bell. Tuning is achieved by lengthening and shortening the leadpipe.