Hope-Jones also developed an imitative version of the diaphone called the diaphonic horn , which had a more reed-like quality than the diaphone and was voiced on lower wind pressures. Wurlitzer built a version of the diaphonic horn for their theater organs at 32′ and 16′ pitches with huge wooden resonators as extensions of its Diaphonic diapason, and at 16′ with metal resonators as an extension of its smaller-scale Open diapason. The Austin Organ Company also developed a metal diaphone at 16′ pitch known as a Magnaton. Due to its penetrating tone, a diaphone-type horn has also been used in foghorns and fire signals.
The role of the two instruments when used as accompaniments is different as well. The piano works well as a leading instrument- the power of percussion instruments comes from the first strike. The piano can also produce rhythms and melodies much faster than an organ, making it an excellent introduction piece. Likewise, it is also a good tool for guiding the melody. An organ is capable of filling a larger space with sound, and supporting a large congregation, for example, in singing. It achieves its power during the sustainment of the notes. A primary function of an organ is to fill in sounds and provide the supporting chords.