The Spectrum Keyboard

SpectrumKeyboard titlepageThe Spectrum Keyboard is a redesigned music keyboard intended for digital synthesizers, samplers, and other electronic media applications. It is planned as a ‘musical typewriter’, making the playing of chords and scales much easier than the old black-and-white keyboard. This is the first version (1988) of the keyboard built in New York in 1991 called the Terpstra-keyboard.

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http://www.siementerpstra.com/writings/Terpstra-SpectrumKeyboard.pdf