The black Moogerfooger MF-101 Low-Pass Filter from Moog is a tabletop- or pedalboard-operable voltage-controlled low-pass filter for both line- and instrument-level sources. It can be used for synths, guitar, and bass as well as recorded sources.

The MF-101 features an adjustable envelope follower that produces a control voltage based on the dynamics of its input, creating a higher voltage the harder you play. The low-pass filter itself has a selectable cutoff frequency between 20Hz and 12kHz, and the adjustable resonance allows you to dictate whether you want the frequencies near the cutoff to be boosted, and by how much. You can set the filter's frequency response for bright or dark by selecting between 2- or 4-pole operation. The mix knob allows you to set the wet/dry rate, while 1/4" inputs for cutoff, mix, resonance, and amount allow you to integrate an expression pedal for further control and manipulation of your sound.

Controls 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 low-pass 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'
I/O Audio In: 1/4" (6.3 mm) phone jack - accepts any instrument-level or line-level audio signal from -16 dBm to 4 dBm 
Audio Out: 1/4" (6.3 mm) phone jack, -4 dBm nominal output level 
Cutoff, Resonance, Amount, Mix: 1/4" (6.3 mm) jacks that accept Moogerfooger EP1 (or equivalent) expression pedals, or control voltages from either two-circuit or three-circuit 1/4" (6.3 mm) jacks 
Envelope Out Jack: delivers the Envelope Control voltage for use by other voltage-controlled devices 
9 V Power Input Jack: accepts standard 9 V power adapters
Power Requirements 105 to 125 V AC 
5 W 220 AC 50 Hz
Dimensions (L x H x W) 9 x 6 x 2.5" (228 x 152 x 64 mm)
Weight 2 lb (907 g)

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