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The saturation control affects primarily the apex of the waveform, similar to the effect of overdriving and saturating the output or interstage transformer of a tube amplifier. Our implementation generates a distortion rich in second harmonics and subtle waveform compression. The harmonic control affects the waveform closer to the zero crossing portion of the waveform, yielding a more distinct overdrive with added higher order harmonics and a steeper signal compression factor. It is important to