Ableton/Live/UG/31 Instrument Reference/09 Operator/05 Filter Section
- The filter shapes the oscillators' output; with classic waveforms Operator can work as a subtractive synth.
- Types: low-pass, high-pass, band-pass, notch and Morph, at 12 or 24 dB, with circuit models made with Cytomic:
- Clean — efficient, same as EQ Eight's filters; all types.
- OSR — state variable with a hard-clipping diode, from a rare British mono synth; all types.
- MS2 — Sallen-Key with soft clipping, from a famous Japanese semi-modular; low- and high-pass.
- SMP — a custom design between MS2 and PRD; low- and high-pass.
- PRD — a ladder with no resonance limiting, from an American dual-oscillator mono synth; low- and high-pass.
- Frequency and Resonance; non-Clean low-, high- and band-pass add Drive.
- Morph sweeps low-pass → band-pass → high-pass → notch → low-pass; its context menu snaps to each.
- The display switches between filter envelope and response curve; drag the curve to set cutoff and resonance.
- Cutoff modulation: Freq < Vel, Freq < Key, Envelope, and the LFO via Dest. A "FIL" or Dest. B. Play by Key in the Frequency context menu sets Freq < Key to 100% and cutoff to 466 Hz.
- Shaper curve with Shp. Drive and Dry/Wet after the filter; 0% wet bypasses it.
