Control device for use as keyboard on e.g. harpsichord, has twelve keys distributed into two groups such that one of groups includes eight keys and other group comprises four keys

摘要

The device has twelve keys distributed into two groups such that one of the groups includes eight keys and the other group comprises four keys. The former group of keys is different from the latter group of keys by visually perceptible characteristics and/or tactile perceptible characteristics. Each key is associated to sound having a predetermined level. The twelve keys are arranged in an orderly manner according to height of the sound, so that each group of keys forms chromatic range of sounds.