Ableton/Live/UG/29 Audio Effect Reference/29 Phaser-Flanger
- Phaser-Flanger combines a phaser, a flanger and a doubler in one device, with two LFOs and an envelope follower.
- Modes, chosen in the display:
- Phaser — modulated all-pass filters feed a phase-shifted copy back in, creating moving notches. The display shows the notches. Notches sets how many; Center their center frequency; Spread their spacing (all-pass Q); Blend routes modulation between Center (0.0) and Spread (1.0).
- Flanger — a modulated, fed-back delay gives a moving comb filter. Time sets the delay; in the display, moving right shortens the delay and left lengthens it.
- Doubler — modulated delays imitate stacked takes. Time sets the delay; modulation is bipolar, so right lengthens and left shortens.
- The title bar button unfolds the device, showing more LFO options, LFO2, the envelope follower, Safe Bass and an LFO display.
- Main LFO:
- Freq/Rate — in Hz or synced, chosen with the Modulation Sync buttons
- LFO Waveform — Sine, Triangle (default), Saw Up, Saw Down, Rectangle, Random, Random S&H, plus Triangle Analog (a filtered square that changes shape and level with rate), Triangle 8 and Triangle 16 (stepped in 8 or 16)
- LFO Stereo Mode — Phase (left/right offset; 180° is inverted) or Spin (different rates per side)
- Duty Cycle — squeezes the wave toward the start (100%) or end (−100%) of its cycle, like pulse width; no effect on Random and Random S&H
- LFO2 is always a triangle. LFO2 Mix blends it with the main LFO (0% main only, 100% LFO2 only); LFO2 Freq/Rate sets its speed, free or synced with Modulation Sync 2.
- Global:
- Amount — modulation depth for both LFOs
- Feedback — output fed back for a stronger comb-filter sound; in Doubler it also keeps echoing after playback stops. Ø inverts it for a hollow sound. High feedback can jump in level quickly — protect ears and equipment.
- Env Fol with Envelope Amount (negative inverts) turns input level into modulation; Attack and Release set its response.
- Safe Bass — high-pass from 5 Hz to 3000 Hz that keeps the effect off the lows
- Output, Warmth (slight distortion and filtering), Dry/Wet (100% on a return track)
