The Moog synthesizer (pronounced MOHG) is a type of synthesizer made up of separate parts. It was invented by American engineer Robert Moog in 1964. Moog’s company, R. A. Moog Co., made many models from 1965 to 1981 and again in 2014. It was the first synthesizer sold to the public and helped create the idea of analog synthesizers.
The Moog synthesizer has separate parts called modules. These modules create and shape sounds, and they are connected using patch cords. Examples of modules include voltage-controlled oscillators, amplifiers, filters, envelope generators, noise generators, triggers, and mixers. The synthesizer can be played with tools like keyboards, joysticks, pedals, and ribbon controllers, or it can be controlled using sequencers. Its oscillators produce waveforms, which can be changed and filtered to shape sounds (a process called subtractive synthesis) or used to control other modules (a method called low-frequency oscillation).
Moog created the synthesizer because musicians wanted more practical and affordable electronic music tools. He worked with composers like Herb Deutsch, Richard Teitelbaum, Vladimir Ussachevsky, and Wendy Carlos to improve the design. His main innovation was voltage control, which uses electrical signals to change pitch. He also introduced important ideas like modularity and envelope generators.
The Moog synthesizer became famous after the 1968 album Switched-On Bach, which used the synthesizer to play music by Johann Bach. Mort Garson used the Moog to create the soundtrack for the Apollo 11 moon landing, linking synthesizers to space in popular culture. In the late 1960s, rock and pop bands like the Doors, the Grateful Dead, the Rolling Stones, and the Beatles used the Moog. During the 1970s, it was widely used in progressive rock by groups like Yes, Tangerine Dream, and Emerson, Lake & Palmer. Because the Moog could imitate instruments like strings and horns, it caused concern among session musicians, and for a time, it was not allowed in some commercial music work. In 1970, Moog Music released a portable version called the Minimoog.
Development
In the early 1960s, electronic music technology was limited. Musicians used tape recorders, electronic test equipment, and spliced together recorded tape to create music. At first, this method was used by experimental composers to make music that was not popular with many people. Later, it was used to create music for commercials and science fiction shows, such as Forbidden Planet and Dr. Who. In 1963, Robert Moog, an American engineer and doctoral student at Cornell University who designed and sold theremins, met composer Herb Deutsch at a trade fair in Rochester, New York. Deutsch had been making electronic music using a theremin, tape recorder, and a single-pitch oscillator, a process that required cutting and splicing tape. Recognizing the need for better tools, Moog and Deutsch talked about creating a "portable electronic music studio."
Moog received a $16,000 grant from the New York State Small Business Association and began working in Trumansburg, New York, near Cornell University. At the time, synthesizer-like instruments were large and filled entire rooms. Moog aimed to build a smaller, more practical instrument that musicians could use. Learning from his earlier experience building a costly guitar amplifier, he believed that usefulness and affordability were most important.
Earlier synthesizers, like the RCA Mark II, used hundreds of vacuum tubes to create sound. Instead, Moog used newly available silicon transistors, which had an exponential relationship between input voltage and output current. With these, he created a voltage-controlled oscillator (VCO), which produced a waveform whose pitch could be changed by adjusting voltage. Moog designed his synthesizer to use a standard of one volt per octave and used voltage to control loudness with voltage-controlled amplifiers (VCAs).
Moog built a prototype with two VCOs and a VCA. Since the VCOs could output voltage, one could be used to change the output of another, creating effects like vibrato and tremolo. When Deutsch saw this, he became excited and immediately started making music with the prototype, drawing the attention of people nearby. "They would stand there, listen, and shake their heads… What is this weird sound coming from the basement?"
In 1964, Moog and Deutsch demonstrated the synthesizer at the electronic music studio at the University of Toronto. After the presentation impressed composers, Moog was invited by the Audio Engineering Society to present at their annual convention in New York City that October. Though he had not planned to sell synthesizers there, some customers placed orders, and choreographer Alwin Nikolais became the first person to buy a commercially made Moog synthesizer.
Moog built synthesizers to order. The first complete synthesizer, which required designing a keyboard and cabinet, was ordered by composer Eric Siday. Without books or a way to save or share settings, early users had to learn the synthesizer through word of mouth or seminars led by Moog and Deutsch.
Moog improved the synthesizer based on feedback from musicians and composers. For example, after Deutsch suggested a way to fade notes in and out, Moog created an envelope module using a doorbell button as a model. At the suggestion of composer Gustav Ciamaga, Moog developed a filter module, which allowed frequencies to be removed from waveforms. His first filter design created a sound similar to a wah-wah pedal. Later, he created the "ladder" filter, the only part of the synthesizer design that Moog patented, granted on October 28, 1969. Further improvements came from suggestions by musicians like Richard Teitelbaum, Vladimir Ussachevsky, and Wendy Carlos. Carlos proposed the first touch-sensitive keyboard, portamento control, and filter bank, which became standard features.
There was debate about whether keyboards should be included in synthesizers. Some, like composer Vladimir Ussachevsky and Moog’s competitor Don Buchla, believed they limited creativity. However, Moog recognized that most customers wanted keyboards, which made the instrument more accessible. Including keyboards in photographs helped users understand that the synthesizer was for making music.
The word "synthesize" means to combine parts to make a whole. Moog initially avoided using the term because it was linked to the RCA synthesizer and instead called his invention a "system" of "electronic music modules." After many discussions, Moog told composer Reynold Weidenaar: "It's a synthesizer and that's what it does, and we're just going to have to go with it." He first used the word in print in 1966. By the 1970s, "synthesizer" became the standard term for such instruments.
Most of the Moog modules were finalized by the end of the 1960s and remained largely unchanged until Moog Music stopped operating in the 1980s. Moog had pursued the development of his synthesizer as a hobby and emphasized that he was not a businessman, nor did he know what a balance sheet was. He compared the experience to riding theme park rides: "You know you're not going to get hurt too badly because nobody would let you do that, but you're not quite in control." In 1982, Moog donated his synthesizer prototype to the Henry Ford Museum’s permanent collection. In 1989, the Stearns Collection of Musical Instruments at the University of Michigan acquired Nikolais’ 1964 Moog synthesizer for their permanent collection. The museum director said it was "to the music world what the Wright Brothers’ airplane is to aviation."
Components
The Moog synthesizer is made up of separate parts, such as oscillators, amplifiers, envelope generators, filters, noise generators, triggers, and mixers. These parts can be connected in many ways using cords. The parts can also control each other. No sound is made until the parts are connected properly.
Oscillators create different waveforms, such as a "bright, full, brassy" sawtooth wave, a thinner, flute-like triangle wave, a "nasal, reedy" pulse wave, and a "whistle-like" sine wave. These waveforms can be changed and filtered to create more sounds (subtractive synthesis). Oscillators are hard to keep in tune, and small temperature changes cause them to change quickly. Because early users of the Moog were more interested in making experimental music than playing regular melodies, Moog did not focus on keeping the oscillators stable.
The Moog's 24db low-pass filter is special because it creates a "rich," "full," and "fat" sound. The filter uses pairs of transistors connected by capacitors in a ladder-like setup. It reduces sounds above a certain frequency set by the user and increases sounds near that frequency. When pushed too hard, the filter creates a unique distortion known as the "Moog sound."
The synthesizer can be played using tools like keyboards, joysticks, pedals, and ribbon controllers. The ribbon controller lets users change pitch in a way similar to moving a finger along a violin string.
Impact
New Scientist described the Moog as the first commercial synthesizer. It was smaller than earlier synthesizers and much less expensive, costing US$10,000 compared to the six-figure prices of other models. Unlike the RCA Mark II, which used punchcards for programming, the Moog synthesizer could be played in real time using a keyboard, making it appealing to musicians.
According to the Guardian, Moog’s 1964 paper, Voltage-Controlled Music Modules, introduced the modern idea of an analog synthesizer. The authors of Analog Days noted that while voltage control and circuit designs were not new, Moog’s innovation was combining these elements, solving the problem of exponential conversion with transistor circuits, and creating working systems that interested musicians.
Features such as voltage-controlled oscillators, envelopes, noise generators, filters, and sequencers became standard in synthesizers. The ladder filter has been copied in hardware synthesizers, digital signal processors, field-programmable gate arrays, and software synthesizers.
Most Moog synthesizers were owned by universities or record labels and used to create soundtracks or jingles. By 1970, only 28 were owned by musicians. The Moog was first used by experimental composers like Richard Teitelbaum, Dick Hyman, and Perrey and Kingsley.
The composer Mort Garson recorded the first West Coast album using the Moog synthesizer, The Zodiac: Cosmic Sounds (1967). Moog attended a recording session for the album, which helped him see the synthesizer’s commercial potential. Garson also used the Moog to write jingles and soundtracks, making its sounds widely known. In 1969, Garson used the Moog to compose a soundtrack for the Apollo 11 moonwalk, connecting electronic music with space in American popular culture.
In 1968, Wendy Carlos released Switched-On Bach, an album of Bach compositions arranged for the Moog synthesizer. It won three Grammy Awards and was the first classical album to be certified platinum. The album helped popularize the Moog and showed that synthesizers could be more than "random noise machines." For a time, the name "Moog" became a common term for any synthesizer. Moog liked this but disliked the many low-quality novelty records released with his name, such as Music to Moog By, Moog España, and Moog Power.
In 1968, Doug McKechnie gained access to a Moog modular Series III (one of the first, with serial number 004) through his friend Bruce Hatch. McKechnie was among the first musicians to use the instrument in live performances. He played it on "What's Become of the Baby" from the Grateful Dead’s Aoxomoxoa (1969) and performed live with the band at Bay Area events and the Altamont Free Concert (1969). He also used the Moog for a performance of Terry Riley’s In C at the San Francisco Opera House (1969). Other performances included at the opening of Frank Oppenheimer’s Exploratorium, the multimedia attraction Robin (1972) at the Family Dog concert hall, and the first concert at the Berkeley Art Museum. McKechnie had to stop using the Moog after Hatch sold it to Tangerine Dream in 1972.
An early use of the Moog in rock music was the 1967 song "Strange Days" by the Doors. The same year, the Monkees used a Moog on their album Pisces, Aquarius, Capricorn & Jones Ltd. In 1969, George Harrison released an album of Moog recordings, Electronic Sound, and the Beatles used the Moog on several tracks of their album Abbey Road. Other rock bands that adopted the Moog included the Grateful Dead and the Rolling Stones. It was also used by jazz musicians such as Herbie Hancock, Jan Hammer, and Sun Ra.
In the 1970s, during its peak popularity, the Moog was used by progressive rock bands like Yes, Tangerine Dream, and Emerson, Lake & Palmer. Keith Emerson was the first major rock musician to perform live with the Moog, and it became a signature part of his performances. According to Analog Days, musicians like Emerson "did for the keyboard what Jimi Hendrix did for the guitar."
Almost every element of Donna Summer’s 1977 song "I Feel Love" was created with a Moog synthesizer, with producers aiming for a futuristic sound. Robert Moog criticized the sequenced bassline, calling it "sterile," and said Summer sounded like she was "fighting the sequencer." In later decades, hip hop groups like the Beastie Boys and rock bands such as They Might Be Giants and Wilco revived interest in the early Moog’s sounds.
The Guardian wrote that the Moog synthesizer, with its new sounds, appeared during a time in American history after the Vietnam War when "nearly everything about the old order was up for revision." Session musicians worried that synthesizers, which could imitate instruments like strings and horns, might threaten their jobs. For a time, the Moog was banned from use in commercial work in the U.S., a rule negotiated by the American Federation of Musicians (AFM). Robert Moog believed the AFM did not understand that the synthesizer was an instrument to be learned and mastered, not a machine that could instantly produce any sound.
Successors
In 1970, Moog Music introduced the Minimoog, a small, self-contained synthesizer. At this time, modular systems became less important in Moog's business. The Minimoog is often called the most famous and influential synthesizer in history.
After Moog Music was sold, production of Moog synthesizers stopped in the early 1980s. The patents and rights to Moog's modular circuits ended in the 1990s. In 2002, Robert Moog regained control of the Moog brand and bought the company. He then released the Minimoog Voyager, an improved version of the original. Starting in 2016, Moog produced updated versions of the Minimoog with some changes. In 2018, Moog released the Grandmother, followed by the Matriarch in 2019. These instruments used design ideas inspired by early Moog synthesizers.
When production of the original Moog synthesizers ended in 1980, other companies, like Synthesizers.com, made their own versions of Moog modules. Moog modules, known as "dotcom" or "5U" format, are still available but have been replaced by the more popular Eurorack format. Since 2020, Behringer has made copies of Moog modules in the Eurorack format, including setups based on original Moog systems.
The Moog synthesizer has been copied in software, such as Arturia Modular V. In 2016, Moog released the Moog Model 15 app, a digital version of the Model 15. The app was first available for iOS and later for macOS in 2021.