DYNAMIC CHORD INTERVAL AND
QUALITY MODIFICATION KEYBOARD,
CHORD BOARD CX10
 Inventor: Grant Johnson, 5025 Deerpark Cr., Fair Oaks, Calif. 95628
 Appl. No.: 19,137
 Filed: Feb. 18, 1993
 Int. CI.6 G10H 7/00; Gl OH 1/38
 U.S. CI 84/637; 84/645
 Field of Search 84/610, 613, 626, 634,
 References Cited
U.S. PATENT DOCUMENTS
3,889,568 6/1975 Amaya .
4,389,914 6/1983 Uetrecht et al 84/669
5,099,738 3/1992 Hotz 84/617
5,223,655 6/1993 Watanabe et al 84/637
Primary Examiner—William M. Shoop, Jr.
Assistant Examiner—Jeffrey W. Donels
Attorney, Agent, or Firm—Alfred A. Equitz; Limbach &
to take advantage of this new musical interface which makes the playing of an unlimited variety of chords and their respective note patterns not only possible, but easy. Yet the design of the Chord Board allows for an extremely complex performance from a musician who has the ability and skill to make such a performance. The Chord Board is designed to maximize the potential for the introduction of the human element into the musical performance. The player interface of the Chord Board departs significantly from the traditional piano. There are eight banks of eight keys each, three for the left hand, and five for the right hand. These keys are similar in size and shape to the traditional piano-style key, yet there are no black keys in between the white keys. Each of these piano-like keys is mapped to a specific note of a chord grouping. Therefore, it is only possible to play notes that belong to a particular chord, eliminating the possibility of playing an accidental. The chord grouping is selected from an adjacent set of chord selection buttons some of which may be selected simultaneously as modifiers, providing for well over a hundred variations of chord structure within a single chord family. Because the Chord Board is also a fullfledged MIDI controller, the instrument is not limited to a particular niche, but may be used in a variety of musical applications.