Musical input device consisting of a 2D grid of buttons or keys on which any given sequence/combination of musical intervals has the \same shape\ on the keyboard wherever it occurs—within a key, across keys, across octaves, and across tunings
musical input device consisting of a 2D grid of buttons or keys on which any given sequence/combination of musical intervals has the \same shape\ on the keyboard wherever it occurs—within a key, across keys, across octaves, and across tunings (en)