moogerfooger is the trademark for a series of analog effects pedals manufactured by Moog Music. There are currently five 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.
Audio moogerfoogers consist of a black wedge-shaped box, approximately 5 inches by 9 inches, with walnut edges. The face contains an array of knobs, switches and LEDs. All moogerfoogers have a knob that allows the user to fade the effect from a completely dry to a completely wet signal. There is also a stomp 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.
In 2000, digital effects recording studio Bomb Factory worked with Bob Moog to develop music plugins for Pro Tools based on the MF-101, MF-102, MF-103, and MF-104. The plugins allowed the user to replicate the effects of the moogerfoogers while editing or processing digital audio on their computer.
Released in 2000, the MF-104 was manufactured in a limited edition of 1000 units. A special "bucket brigade delay chip" was employed to allow the effect to be completely analog, however the supply of these chips was limited. The final units were sold in 2001 and the MF-104 Analog Delay remains the most sought-after of the moogerfoogers. In 2005, Moog Music announced the planned re-release of the MF-104, dubbed the MF-104Z. The new pedal will have the same functions as the original, but will feature a longer possible delay time (slightly longer than 1 second). At the same time, the MF-104SD was released in a limited edition of 250 units. The MF-104SD had a maximum delay time of 1.4 seconds, slightly longer than the MF-104Z.
The gain of each filter is further controlled by an envelope that is triggered by any of a number of preset animation sequences. The user can select one of 24 animation patterns. Rhythmic variations can be created by adjusting the levels of the filters, speed of animation, and envelope amount.
On the left hand of the box the FreqBox contains a VCO which has two knobs to control frequency and waveshape. The waveshape runs from triangle wave to sawtooth wave to square wave to pulse wave. There is a hard sync on/off switch that turns on hard syncing the VCO signal with the input signals frequency. The amplitude of the VCO is controlled by the amplitude of the input signal.
On the right hand side there are three knobs. A mix knob to mix the level of input signal with the level of the VCO signal, a FM Amount knob that allows the input signal to modulate the VCO with frequency modulation and an Env. Amount knob that sets an envelope to the frequency modulation.
The CP-251 features an LFO with adjustable rate and square and sine outputs, a lag processor that can alter the rise and fall of a signal, a multiple jack that splits one signal into three identical signals, a white noise generator, two attenuators, a four-way mixer that can process four signals into one, and a sample and hold. The sample and hold samples a voltage (the noise source) every time a trigger voltage (the square LFO) crosses the threshold. The sampled voltage appears in the output. The user can also use alternate sample and/or trigger voltages to produce desired effects.