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an actual theremin has two high frequency (inaudible) oscillators, one fixed, one variable - controlled by the antenna. what you hear is the difference (beat frequency) between the oscillators - that's how such a small change in capacitance creates such a large shift in pitch and why it sounds so unique. now we can do the same thing by converting that capacitance in to a control voltage (ala Z.vex etc.) but important to note how the theremin was so ahead of the curve.