The development of valve instruments can be divided into two categories—instruments of pure descent: trumpet, trombone and horn; and those whose further development required the introduction of valves. The flügelhorn is one of these. Neither as flexible in use as the cornet, nor with the edge to the tone characteristic of the trumpet, it is, however, louder and richer in sound than either.

It is interesting to note that the flügelhorn—with a few exceptions—was never really adopted by composers of classical orchestral works, and as a result, flügelhorns are virtually absent from concert halls. But having recognized its sound and flexibility, the British Brass Band features the flügel, and of course it is a longtime favorite among jazz musicians.

Kanstul has embellished the flügel tonal characteristics through the use of other bell materials such as copper and bronze. By correcting the taper, intonation has been perfected, tone color enhanced, and playing through the registers now requires less effort than ever before.