Moogerfooger is the trademark for a series of analog effects pedals manufactured by Moog Music. There are currently eight different pedals produced; however, one of these models is designed for processing control voltages rather than audio signal. A sixth model, the Analog Delay, was released in a limited edition of 1000 units and has become a collector's item. Moog Music announced on August 28, 2018, that the Moogerfooger, CP-251, Minifooger, Voyager synthesizers, and some other product lines were being built using the remaining parts on hand and discontinued thereafter. Audio moogerfoogers consist of a black wedge-shaped box, approximately , with walnut edges. The face contains an array of knobs, switches and LEDs. There is also a foot switch that allows the user to toggle the effect on and off and a knob that controls the gain. True to the nature of modular synthesizers, all parameters on the pedals are variable using control voltages which may be plugged into the rear of the pedal using 1/4" jacks. MF-101 The MF-101 is an independent analog low-pass filter. Based on the amplitude of the dry audio signal, an envelope is generated. This envelope alters the filter's cutoff frequency and its amount is variable. Knobs also allow controlling of the filter's frequency (from 20 Hz to 12 kHz) and resonance. The resonance can be increased to the point of self-feedback producing a pitch that follows the filter cutoff frequency. The MF-101 was released by Big Briar (now Moog Music) in 1998. MF-102 The MF-102 is an analog ring modulator. This moogerfooger heterodynes the dry audio signal with a carrier wave that is generated by an internal oscillator. The user can vary the frequency of the carrier oscillator from 0.6 Hz to 80 Hz on the Lo setting and from 30 Hz to 4 kHz on the Hi setting. The MF-102 also features an independent low frequency oscillator (LFO) that changes the frequency of the carrier oscillator. The user can select between two LFO waveshapes, either a square or sine-like (really a triangle) wave. The frequency range of the LFO was continuously variable from 0.1 Hz (one cycle every ten seconds) to 25 Hz. The user can also vary the amount, if any at all, which the LFO affects the carrier frequency. Like the MF-101, the MF-102 was released in 1998. MF-103 The MF-103 is an analog twelve stage phaser. The user can control the