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Allpasser

Dusty Devices

Where to get itAvailable from Dusty Devicesreasonstudios.com

Allpasser is a 2-pole allpass filter effect by Dusty Devices that alters the phase of specific frequencies without applying conventional filtering. It features two independent filter stacks, three LFOs, an envelope follower, and a flexible modulation matrix, enabling complex phasing effects, transient spreading, and spectral manipulation—from classic phaser sounds to creative sound design applications.

Written from the manual and checked against it. How we check

Key Features

01Two 2-pole allpass filter stacks with independent Freq, Q, and Stack parameters
02Feedback control (±99%) introducing resonances and cancellations
03Two LFOs with Sine, Triangle, Sawtooth, Square, S&H and S&H Lerp waveforms
04Envelope follower with Attack (1 ms–10 s) and Release (1 ms–10 s) times
05Four Processing Modes: Series, Parallel, Left/Right, and Mid/Side
06Analysis display showing Phase, Group Delay, and Magnitude responses

Things to Try

  • 01Enable Anti-Ring when experimenting with fast modulation on frequencies to prevent high-frequency ringing
  • 02Use an LFO with phase offset to modulate both filter frequencies differently in Left/Right mode
  • 03Apply the modulation matrix LPF smoothing filter when self-modulating an LFO's own rate for interesting pitch warping
  • 04Offset an LFO's phase while modulating its own rate for dynamic waveform distortion effects

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Allpasser by Dusty Devices | Plugin Library