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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.
A similar keyboard was developed by Larry Hanson [4] in 1942 for use with a 53 tone scale but turns the fifth sideways and the major third to the right and up. Keyboard note layout of the Harmonetta. The modern layout was proposed in 1983 by inventor Peter Davies, who obtained an international patent for its use in instruments in 1990.
Pressing a key on the keyboard makes the instrument produce sounds—either by mechanically striking a string or tine (acoustic and electric piano, clavichord), plucking a string (harpsichord), causing air to flow through a pipe organ, striking a bell , or activating an electronic circuit (synthesizer, digital piano, electronic keyboard).
A typical 105-key computer keyboard, consisting of sections with different types of keys. A computer keyboard consists of alphanumeric or character keys for typing, modifier keys for altering the functions of other keys, [1] navigation keys for moving the text cursor on the screen, function keys and system command keys—such as Esc and Break—for special actions, and often a numeric keypad ...
Tuning Exploration, play the Wicki layout on your computer keyboard while changing the tuning dynamically. The Hayden duet system concertina – Resource List . Relayer : an app (Windows and OS X) that enables musicians who play the QWERTY computer keyboard or the AXiS-49 MIDI controller, to play in a wide variety of isomorphic note layouts ...
The Selmer Balanced Action saxophone was manufactured by Selmer from 1935 through 1947. It introduced a revolutionary new layout for the key table operating the G ♯ and low C ♯, B, and B ♭ keys. The layout solved long-standing deficiencies in those mechanisms and all modern saxophones have left hand key tables derived from this ...
It is a transposing instrument in the key of E ♭, pitched an octave plus a major sixth lower than written. It is one octave lower than the alto saxophone. Modern baritones with a low A key and high F ♯ key have a range from C 2 to A 4. As with all saxophones, its music is written in treble clef [broken anchor].
The possibility of the duplication of pitches occurs because the generalized keyboard is, in principle, a mapping of pitches onto a closed space in which intervals and chords have fixed shapes under transposition across the keyboard; thus a generalized keyboard is a useful tool for the analysis of harmonic structures.