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Moog Moogerfooger MF-101 Lowpass Filter

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Moog MF-101

The Moog MF-101 is a classic for a reason. This award-winning pedal is a descendent of the original Moog modular synthesizers. It boasts two primary functions: it can be used as a voltage controlled low-pass filter and as an envelope follower with any line-level signal.

All of the pedal’s essential parameters can be controlled via expression pedal (not included), or with external control voltages. Consequently, the pedal works particularly well alongside modular synthesizer gear. The unit’s front panel interface features dedicated panel switches that select the filter mode and envelope follower speed. Additionally, the pedal has 1/4” jacks for audio input/output and a dedicated bypass switch that is ideal for tabletop or stompbox applications. 

MF-101 Features

  • CUTOFF rotary control, which varies the filter's cutoff frequency over an eight-octave range
  • RESONANCE rotary control, which varies the shape of the filter's response, from pure lowpass to actual oscillation
  • ENVELOPE AMOUNT rotary control, which adjusts the amount that the input signal's envelope sweeps the filter cutoff frequency
  • MIX rotary control, which crossfades continuously from unfiltered to filtered audio
  • DRIVE rotary control, which adjusts the gain of the audio input
  • SMOOTH-FAST rocker switch, which chooses between smooth and fast envelope follower response
  • 2-POLE 4-POLE rocker switch, which chooses between 2-pole (bright) and 4-pole (deep) filter frequency response
  • LEVEL, a three-color LED that is used to set the DRIVE control
  • ENV, a LED that indicates the strength of the envelope voltage
  • BYPASS, a two-color LED that tells whether the filter is on or bypassed
  • ON/BYPASS, a rugged, smooth-acting 'stomp switch.'


  • AUDIO IN 1/4" phone jack - accepts any instrument-level or line-level audio signal from -16 dBm to +4 dbm
  • AUDIO OUT 1/4" phone jack - -4 dBm nominal output level
  • CUTOFF, RESONANCE, AMOUNT, MIX, all of which are stereo 1/4" jacks that accept moogerfooger EP1 (or equivalent) expression pedals, or control voltages from either two-circuit or three-circuit 1/4" jacks
  • ENVELOPE OUT jack - delivers the Envelope Control voltage for use by other voltage-controlled devices
  • +9V POWER INPUT jack - accepts standard 9 volt power adaptors (power adaptor included)
  • CASE: Black panel with hardwood sides
  • DIMENSIONS: 9" x 6" x 2-1/2"
  • NET WEIGHT: 2 lb
  • SHIPPING WEIGHT: 4 lb, including power adaptor and instruction manual
  • POWER REQUIREMENTS: 105-125 volt, 5W
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