The Fine Controls give you access to great sounding, easy-to-adjust, and unprecedented sonic options.
Auto dynamically adjusts the frequency response of the Sibilants. The more Auto, the more frequency peaks that usually result in unpleasant sounding resonances are removed. To help visualize it's effect, the external crown lights up when it's working.
Smooth adds a gentle and natural saturation in order to remove peakiness and high amplitudes from the Sibilants, without harshness. To help visualize it's effect, the external crown lights up when it's working.
Gain allows you to attenuate or boost the output +/- 18dB.
Dry / Wet
Dry/Wet Allows you to blend the direct signal with the processed signal.