FabFilter One was created to be the best cut-off filter ever. Our new design approach has resulted in the fattest and smoothest self-oscillating digital filter you have ever heard. It has been tuned carefully to achieve the character and warmth of a classic analog synthesizer. FabFilter One's filter sounds raw but never cheap or 'digital', even at full resonance.
The filter is fed by an equally high-quality solid-sounding oscillator, developed from scratch to be completely aliasing-free. It features sawtooth, triangle, and square wave forms with pulse width modulation. Many more features.