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.
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.
Source: Wikipedia "Isomorphic keyboard" · CC BY-SA 4.0
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