Moog Moogerfoogers All-In-One # 3 Kit, Includes MF-101 Low-Pass Filter, MF-102 Ring Modulator, MF-107 FreqBox

MF-101 Lowpass Filter
The award-winning MF-101 Lowpass Filter is a direct descendant of the original Moog modular synthesizers. It contains two complete modular functions: a voltage-controlled lowpass filter and an envelope follower. It can be used with any instrument-level to line level-signal. The moogerfooger filter's control parameters are signal mix, cutoff frequency, resonance amount and envelope amount. All of the Lowpass Filter's parameters can be controlled with expression pedals or external control voltages as well as by great feeling knobs which beg to be tweaked. Panel switches select filter mode and envelope follower speed. 1/4" jacks are provided for audio input and output, pedal/control inputs and envelope follower output. A heavy-duty, yet smooth-acting bypass switch allows tabletop or foot operation.

• 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).

A lowpass filter removes high frequencies from a tone. It makes the tone sound more mellow or muted. The lower the Cutoff, the more muted the tone sounds. Imagine a window shade. As it is pulled down, it cuts out the higher light, then the light from the middle of the window, then finally all the light. The MF-101 Lowpass Filter does the same sort of thing to the sound spectrum with its Cutoff Control. As you turn up the Resonance control, the overtones near the cutoff frequency are boosted. Resonance gives the moogerfooger filter the same classic Moog filter sound as the Minimoog; and Moog modular synthesizers.

The envelope follower tracks the loudness contour (envelope) of a sound and produces a voltage that follows the dynamics of your playing. Every time you play a note, the envelope voltage goes up and then down. The harder you play, the higher the envelope voltage goes. The envelope follower opens and closes the lowpass filter. Think of the envelope voltage as an invisible hand that turns the CUTOFF knob up and down every time you play a note. Since the envelope follows the dynamics of your instrument's signal, you actually play the filter as you play your instrument.

MF-102 Ring Modulator
The MF-102 Ring Modulator is a direct descendant of the original Moog modular synthesizers. It contains three complete modular functions: a ring modulator, a voltage-controlled carrier oscillator and voltage-controlled dual-waveform LFO. It can be used to process any instrument-level to line-level signal. A ring modulator produces sum and difference frequencies between the audio input and a carrier oscillator. The ring modulator's LFO can be used to modulate the carrier frequency. The moogerfooger ring modulator can create effects ranging from subtle tremolo to harmonically rich distortion, gong-like sounds, sweeps, swoops and divebombs. It can be subtle or outlandish in it's use - you decide!

• Frequency rotary control, which varies the carrier frequency over a six-octave range.
• Rate rotary control, which varies the LFO's frequency from 0.1 Hz to 25 Hz.
• LFO Amount rotary control, which adjusts the amount that the LFO output sweeps the carrier oscillator.
• Mix rotary control, which crossfades continuously from unmodulated to modulated audio.
• Drive rotary control, which adjusts the gain of the audio input.
• Square-Sine rocker switch, which chooses the LFO waveform.
• LO-HI rocker switch, which chooses between the low frequency carrier range (2 Hz to 130 Hz) and the high frequency carrier range (60 Hz to 4,000 Hz).
• Level, a three-color LED that is used to set the DRIVE control.
• LFO, a LED that indicates the LFO rate.
• Bypass, a two-color LED that tells whether the ring modulator 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.
• Frequency, Rate, Lfo Amount, Mix, all of which are stereo 1/4" jacks that accept moogerfooger EP1 (or equivalent) expression pedals or control voltages from two-circuit or three-circuit 1/4" jacks.
• Aux Audio IN - provides a means of applying an external signal to the ring modulator, in place of the carrier oscillator.
• LFO Out jack - delivers the LFO voltage for use by other voltage-controlled devices.
• CARRIER Out Jack - delivers the carrier signal for use by other devices.
• +9V POWER INPUT Jack - accepts standard 9 volt power adaptors (power adaptor included).

The moogerfooger ring modulator's control parameters are signal mix, carrier frequency, LFO rate and LFO amount. All of the ring modulator's parameters can be controlled by the great feeling knobs that beg to be tweaked as well as with expression pedals or external control voltages. Panel switches select LFO waveform and carrier frequency range. 1/4" jacks are provided for audio input and output, pedal/control inputs, carrier input and carrier output. The heavy-duty yet smooth acting bypass switch allows tabletop or floor use.

Imagine that the ring modulator's carrier oscillator is producing a 500 Hz sine wave and your input signal is a 100 Hz sine wave. The ring modulator's output will be a complex waveform. You will hear two pitches: 400 Hz and 600 Hz. You will not hear your original input or the carrier oscillator. The MF-107 FreqBox is different from other effects f the effected sound is not a processed version of your input signal, but the sound of the input signal modulating an internal oscillator. It contains a VCO with continuously variable waveshape and the capacity to modulate that Oscillator in the following ways:

• the VCO can be hard synced by the input signal
• The VCO can be frequency modulated (FM) by the input signal
• The VCO frequency can be modulated by an envelope follower which tracks the dynamics of the input signal
• The Amplitude of the VCO also tracks the dynamics of the input signal

MF-107 FreqBox
Hard sync is a classic analog synthesis technique where the start of an oscillator's cycle can be reset by another. The oscillator being synced takes on the frequency characteristics of the other oscillator and when its frequency is swept, it reinforces the harmonics of the fundamental frequency. In the case of the FreqBox, the input signal is used to reset the FreqBox's VCO. FM is a technique used to get really rich sounds from simple waveforms. The type of FM used in the FreqBox is linear FM. Sounds range from gong or bell-like tones to sizzly sweeps.

The FreqBox, like all moogerfoogers, works with any instrument to line-level input. In addition to the panel controls there are control inputs for use with expression pedals or control voltages and control outputs for interconnecting moogerfoogers like you would a modular synth. The FreqBox can provide some really unusual processing to all types of signals - guitars, synths, drum sounds, vocals or wind instruments allowing you to enter previously unexplored sonic territory. The MF-107 Freq Box contains an analog VCO with continuously variable waveform which can be modulated by the audio input signal. Modulation of the VCO includes: hard sync, Frequency Modulation and modulation of the VCO frequency by an envelope follower. The amplitude of the VCO is controlled by the amplitude of the input signal.