Ableton/Live/UG/29 Audio Effect Reference/02 Auto Filter/05 Filter Drive and Circuits
- Drive adds input gain before the filter for saturation; 0% leaves the sound unchanged.
- Filter Circuit models analog filter designs. It applies only to Low-pass, High-pass, Band-pass, Notch and Morph.
- SVF — clean, though it distorts with Drive above zero
- DFM — feeds back more of its distortion; from gentle sweeps to warm drive
- MS2 — Sallen-Key design with soft-clipped resonance, modeled on a well-known Japanese semi-modular monosynth
- PRD — ladder design without resonance limiting, modeled on a vintage American two-oscillator monosynth