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isomorphic keyboard
An isomorphic keyboard is a musical input device consisting of a two-dimensional grid of note-controlling elements (such as buttons or keys) on which any given sequence and/or combination of musical intervals has the "same shape" on the keyboard wherever it occurs – within a key, across keys, across octaves, and across tunings.
==Examples==
Helmholtz's 1863 book ''On the Sensations of Tone'' gave several possible layouts. Practical isomorphic keyboards were developed by Bosanquet (1875), Janko (1882), Wicki (1896), Fokker (1951), Erv Wilson (1975–present), Wesley (2001) and Antonio Fernández (2009).〔http://www.upm.es/observatorio/vi/index.jsp?pageac=patente.jsp&idPatente=449〕 Accordions have been built since the 19th century using various isomorphic keyboards, typically with dimensions of semitones and tones. The keyboards of Bosanquet and Erv Wilson are also known as generalized keyboards. The keyboard of Antonio Fernández is also known as Transclado. The Ragzpole is a recently developed cylindrical MIDI controller having dimensions in fifths and major thirds. The Harpejji, while not strictly a keyboard, uses an isomorphic pattern of frets and tapped strings. It has been adopted by many keyboard players, most notably Stevie Wonder.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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