AF-201 (Auto Filter)

Effect Information


  • Sensitivity: Determines when the effect will trigger
  • Peak: Boosts the center frequency for a more dramatic filtering (like a Resonance control on a synthesizer)
  • Filter (LP/BP/HP): Selects the type of filter — Lowpass, Bandpass or Highpass
  • Drive (Up/Down): Selects the direction of the filter sweep — upwards or downwards
  • Range (High/Low): Selects the frequency range of the filter

A review of this effect as well as later models can be found here.

Video Demo

Archived past online sales data:

Effectsfreak legacy website (includes sales data 4/2008 - 4/2021)

OD-9 (Overdrive)
DCL (Digital Stereo Chorus)

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