The organ is based on late 17th century English chamber organs, with mechanical parts and keys based on the mid 18th century chamber organ of Calke Abbey in Derbyshire.
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The compass is C – d³, with four available pitches. The pipes have tuning slides, for different pitches and tuning systems.
The case front is a dummy based on the Galpin organ at the East end of Canterbury Cathedral. There is a foot pedal for raising wind, as well as a separate blower.