Precision Adder

Synthesizers are very sensitive to unintentional variations in pitch control voltage – any error can result in the oscillators under control going out of tune. Therefore, whenever you add together pitch control voltages inside a modular synth, you really should be using a precision adder that precisely adds together the pitch voltages without introducing an error. Ordinary mixers might slightly attenuate or amplify a voltage passed through them, which in most cases would create tuning errors.