Self-Playing Organs
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A mechanical organ is self-playing, as opposed to manual playing by a musician. These organs are traditionally powered by a single shaft, located at the side of the organ case. The axle is attached to a wheel, which can be powered through a variety of sources. Common ones include hand-cranking, electric motors, and steam engines.
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Mechanical organs produce sound using an abundance of different methods. Some instruments utilize a set reeds, similar to those found in a harmonium or reed organ.
The first mechanical organs, barrel organs, implemented a pinned barrel music encoding system. The system only allows for a limited number of short songs. Cylinders are also difficult to change, requiring heavy lifting.
To combat this, in the 1890s, builders started integrating book music into their instruments. This approach allows for an unlimited number of infinitely long songs.
Around the same time, music rolls made their way into the mainstream industry. These are similar to barrels in terms of musical capacity, but are much easier to change. Many German and American organ manufacturers would begin installing roll-frames into their organs. This feature allows them to play rolls.
Starting in the 1950’s, European organ-makers started switching to electronic tone generators to synthesize their organs’ sounds. This approach was much more cost effective and light on resources following World War One and Two.
Starting in the late 1980’s, the rise of MIDI technology presented a new opportunity for organ-builders. MIDI control is now a common feature in mechanical organs.
