the first version used only 8 bit precision for its output digital-to-analog conversion (dac). the instrument suffered from aliasing, which was not due to the typical cause of too low a sample rate or inadequate post-d/a filtering. rather, it was an inherent effect of low precision calculations in the digital circuitry - round-off error produced digital non-linearity and extra harmonics resulting in digital mixing with the sample rate. the problem was solved by dithering, which did not noticeably affect the intended output, but through the natural characteristics of human hearing caused the narrow-band high frequency alias to become imperceptible. in general, in-depth study of psychoacoustics was used to solve such problems and provide some technical constraints.