RezzoEQ features two innovative Spring Resonance Filters that utilize a fast spring resonance algorithm influenced by the input audio signal and its frequencies. These filters function as either low pass or high pass filters, adding unique tonal characteristics to your sound by dynamically responding to the audio input.

Each filter includes adjustable parameters that allow precise control over its behavior. The 'Energy' and 'E-Curve' knobs determine how much energy the spring accumulates and how quickly it reacts to changes in frequency, while the 'Damping' knob controls the decay rate of self-oscillations. With low damping and high energy settings, the filter can produce continuous self-oscillations that follow the input frequencies, creating a distinctive, singing effect.

RezzoEQ also incorporates built-in tanh distortion to manage resonant frequencies, providing smooth yet gritty output volume limiting. This feature enhances the overall tonal texture and adds character, making RezzoEQ a powerful tool for shaping sounds with dynamic resonance and controlled distortion.