The double bell euphonium is a duplex instrument based on the euphonium. The larger bell produces the mellow tone of a standard euphonium; the second smaller bell has a brighter tone, similar to a baritone horn or valve trombone. The instrument is sometimes dismissed as a novelty, but has had a small number of enthusiastic adherents, although few professional musicians use it as their sole or primary instrument. The smaller bell can give more appropriate tone in the higher range of the instrument. The two bells can also be used for special effects, such as echoes, and using the distinctly different tone of the two bells for a single musician to give the effect of call and response.