Musical keyboard instruments have a long history, which resulted in many kinds of keyboards (claviers) today. Since the hardware of conventional musical keyboards cannot be changed, such as the number of keys, musicians have to carry these large keyboards for playing music that requires only a small diapason. To solve this problem, the goal of our study is to construct UnitKeyboard, which has only 12 keys (7 white keys and 5 black keys) and connectors for docking with other UnitKeyboards. We can build various kinds of musical keyboard configurations by connecting one UnitKeyboard to others, since they have automatic settings for multiple keyboard instruments. We discuss the usability of the UnitKeyboard from reviews by several amateur and professional pianists who used the UnitKeyboard.
Takegawa, Y., Terada, T., and Tsukamoto, M. “UnitKeyboard: An Easily Configurable Compact Clavier,” Proceeding of International Conference on New Interfaces for Musical Expression (NIME 2008), pp. 289–292, (June 2008).