Describes theoretical design of an electronic music instrument. Defining differences between electronic music instruments and electronic instruments. Starting with conceptual design based on purpose and function of sound production. Analogue sound is defined as a 3 dimensional phenomena that moves through space in comparison to the 2 dimensional visual representation of sound on a computer screen. The Hordijk system applies the principle of wave phenomena. Originally developed by Isaac Newton to describe the rotational movement of sound. In analogue sound synthesis this is achieved by the horizontal movement of a sine wave and the vertical movement of a cosine wave moving through time.