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Polymoog
Polymoog
Polymoog
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Polymoog and
Polymoog Keyboard
Polymoog Synthesizer 203a
ManufacturerMoog Music
Dates1975–80 (Polymoog)
1978–80 (Polymoog
Keyboard)
Price$5295 (Polymoog Synthesizer)
$3995 (Polymoog Keyboard)[1]
Technical specifications
Polyphony71 (Maximum range of keyboard)
TimbralityMonotimbral
Oscillator2 VCOs
LFO3
Synthesis typeAnalog Subtractive
FilterLow-pass filter,
high-pass filter
Attenuator1
Storage memory8 presets (Polymoog)
14 presets (Polymoog
Keyboard)
Effects3-band EQ
Input/output
Keyboard71 keys, velocity, split
External controlCV/gate
Polymoog 280a Vox Humana
An example of the Polymoog 280a's "Vox Humana" preset, starting with the default mode and engaging variable options afterwards.
Problems playing this file? See media help.

The Polymoog is a hybrid polyphonic analog synthesizer that was manufactured by Moog Music from 1975 to 1980. The Polymoog was based on divide-down oscillator technology similar to electronic organs and string synthesizers of the time.

History

[edit]

The name Polymoog can refer either to the original Polymoog Synthesizer (model 203a) released in 1975, or the largely preset Polymoog Keyboard (model 280a) released in 1978.[2]

The Polymoog's "polycom" voice cards

The Polymoog has a 71-note weighted Pratt & Read touch-sensitive keyboard divided into three sections with a volume slider for each. It also has a three-band resonant graphic equalizer section, which can be changed to a low/bandpass/high-pass filter. The Moog-designed 24 dB/octave filter section allows modulation modulated from its own envelopes, low frequency oscillation and sample and hold circuit. Ranks and waveforms of all notes are also adjustable combining waveforms, octaves, tunings, and their own independent LFO rates and amounts. The user can adjust the instrument's sounds, and it offers presets named "strings", "piano", "organ", "harpsichord", "funk", "clav", "vibes", and "brass". Presets were factory created as physical circuit cards and may be modified for live performance using Var(iation) buttons, triggering a red dot next to the preset number in the display.[3]

The design of the Polymoog is a hybrid of the electronic organ and the synthesizer using divide-down technology, much like other string synthesizers of the time. Unlike later 1970s polyphonic synthesizers, such as the Yamaha CS-80 and Sequential Circuits Prophet-5, the Polymoog cannot create each voice from individual oscillators and filters, or store sounds programmed by the user.[4] Although criticized for its limited programmability, high purchase price of $5295 and reliability issues, the Polymoog Synthesizer was popular with musicians of the period, and its unlimited polyphony was considered revolutionary upon its initial release.[1][5]

Polymoog Keyboard (1978–80)

[edit]
The Polymoog Keyboard model 280a

The Polymoog Keyboard 280a is a stripped-down version of the original 1975 Polymoog. The two are similar in appearance, sharing the same case and keyboard. The right-hand control panel is absent, while the left-hand panel has only a few sliders, giving the user less control over the sounds. The Polymoog Keyboard features more presets than its predecessor: "vox humana", "string 1", "string 2", "electric piano", "piano", "honky tonky", "clav", "harpsi", "brass", "chorus brass", "pipe organ", "rock organ", "vibes", and "funk". Control over these presets is limited to octave balance, envelope attack, and LFO modulation depth and rate. The lower two octaves may also be split off to play a separate bass tone, with some control over this tone allowed via a dedicated bass filter. Filter control of the main preset sounds is not user adjustable other than via an external controller.[6] The Polymoog Keyboard was less expensive than its predecessor, being priced at $3995 in 1979.[1] The best known of the presets on the Polymoog Keyboard is "Vox Humana", which was not present on the original Polymoog. This preset forms the basis of the electronic string sound in the work of Gary Numan.[7][8]

Foot operated controller

[edit]
right: Polymoog with Polypedal

An optional foot-operated controller known as the Polypedal (model 285a), with control voltage jacks, interfaces with the back panel. It allows the user to switch between single and multiple triggering of envelopes, and controls for pitch, filter, and sustain.[9]

Notable users

[edit]

Cat Stevens used the Polymoog on his 1977 album Izitso, including the song "(Remember the Days of the) Old Schoolyard".[10] Gary Numan was one of the Polymoog's most recognizable users. The electronic string sound featured prominently on the track "Cars" and most of the album The Pleasure Principle (1979) became his signature sound in the late 1970s and early 1980s.[11] A Polymoog is shown in his music video for "Cars" as well as in live performances on Top of the Pops and The Old Grey Whistle Test.[12] French duo Space Art used a Polymoog during the recording of their second album, Trip in the Centre Head.[13] Yellow Magic Orchestra used the Polymoog on their early albums and first world tour.[14]

Prince used a Polymoog at Sound 80 recording studio on demo tapes for his first album For You (1978), and the Polymoog became a notable sonic element of the Minneapolis sound.[15]

The Polymoog proved popular with various progressive rock musicians. Keith Emerson added an early prototype Polymoog (at the time, known as the Apollo) to his stage rig.[16][17] Rick Wakeman used one during his second stint with Yes in the late 1970s and Tony Banks of Genesis used one between 1977 and 1981. Keith Godchaux used a Polymoog between 1976-1979 live with the Grateful Dead. Mike Oldfield used a Polymoog on "Sheba" (from his 1980 album QE2) in conjunction with a vocoder.[18][19]

See also

[edit]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Polymoog

View on Grokipedia
from Grokipedia
The Polymoog is a polyphonic developed by , Inc., and released in 1975 as one of the first commercially successful fully polyphonic keyboard instruments, featuring 71 velocity-sensitive keys and preset sounds designed to emulate orchestral and ensemble timbres using innovative divide-down oscillator technology. Developed under the leadership of inventor Dr. David A. Luce amid 's ambitious efforts to create advanced ensemble systems, the Polymoog evolved from the earlier Apollo prototype, which had been tested by musicians like in 1973, and represented a scaled-down realization of the abandoned Constellation project that aimed for a comprehensive modular polyphonic setup. The instrument incorporated custom Polycom integrated circuits—one per key—to enable true , allowing complex chords and full dynamic control, a significant advancement over monophonic synthesizers like the that dominated the era. With an initial investment of around $500,000 in research and development, produced over 5,000 units between 1975 and 1980, positioning the Polymoog as a bridge between traditional organs and modern synthesizers for live and studio use. Key features included eight factory presets—such as Strings, Piano, Organ, Harpsichord, Clavinet, Vibes, Brass, and Funk—along with a programmable "VAR" mode for custom timbres, enhanced by a resonant filter bank, independent envelopes for spectral and loudness shaping, and modulation options like random detuning for chorusing effects. The design emphasized performance versatility with a ribbon controller for pitch bending, foot pedal integration for expression, and back-panel signal routing for integration with other gear, though its divide-down architecture produced sounds often described as ethereal and ensemble-like but sometimes thin compared to later voltage-controlled oscillators. In 1978, Moog introduced the simplified Polymoog Keyboard (model 280a), a preset-only variant without the original's programmable section, to appeal to a broader audience seeking reliability over customization. The Polymoog gained prominence in , , and , with notable endorsements and uses by artists including , , and on early tours, as well as Kraftwerk's , Prince, and Blondie. The 280a model's "Vox Humana" preset became iconic in Gary Numan's 1979 hit "Cars," contributing to the sound of the late 1970s and 1980s. Despite its sonic innovations, the instrument's complexity led to notorious reliability challenges, including frequent failures in modulation circuitry and a near-200% repair rate, which tarnished its reputation and contributed to its discontinuation by 1980. Today, restored examples remain sought after by collectors and performers for their unique polyphonic capabilities, influencing modern emulations like Cherry Audio's Polymode plugin.

Design and Technology

Polyphonic Capabilities

The Polymoog achieved true through an adaptation of divide-down oscillator technology originally derived from electronic organs, enabling simultaneous playback of up to 71 notes without key assignment conflicts. This system utilized two ranks of top-octave synthesizers—12 oscillators each for sawtooth and waveforms—that generated the highest octave's frequencies, with digital dividers cascading down to produce the full range of pitches across the keyboard. Each note's signal was then processed independently via 71 custom Polycom integrated circuits, one per key, which handled waveshaping, amplification, and dynamic control to ensure clean polyphonic performance. Timbre shaping in the polyphonic section employed an approach, where raw waveforms passed through per-voice fixed bandpass filters within each Polycom chip to emphasize harmonic content and . Each voice featured two such fixed filters, allowing preset-specific tonal characteristics by selectively boosting frequency bands, akin to formant synthesis for vocal-like or instrumental emulation. The eight factory presets for the Polymoog 203a model—Strings, , Organ, , , , Vibes, and —leveraged these filters to create distinct timbres, with Strings offering lush, ensemble-like swells through broad low- and mid-range emphasis. Key technical specifications supported this polyphonic design, including a 71-note velocity-sensitive keyboard spanning from E1 to D7, with individual attack and release envelopes per voice via the Polycom chips' integrated generators for nuanced articulation. The instrument also included a separate monophonic section that could layer lead sounds over the polyphonic bed. The complexity of maintaining 71 independent voice circuits contributed to notable reliability challenges, including tuning drift from the analog oscillator ranks due to thermal variations and component aging, as well as high failure rates in the Polycom chips, which often resulted in dead notes or intermittent in early production units. These issues necessitated frequent servicing, with observed component failure rates exceeding 100% over the instrument's lifespan in many cases.

Control Interface and Presets

The Polymoog's control interface centers on a designed for intuitive access to its polyphonic sound generation capabilities, featuring eight dedicated preset selector switches labeled for Strings, , Organ, , Funk, Clavinet, Vibes, and , alongside a Variable (VAR) mode button that activates real-time parameter adjustments. These selectors enable quick switching between factory-optimized sounds, with each preset drawing from the instrument's polyphonic voice architecture to produce distinct timbres, while the master volume slider provides overall output control. Additionally, the panel includes inputs for a , which modulates decay and release times across presets. Preset editing is constrained to real-time modifications rather than storage, with sliders dedicated to filter , (emphasis), and parameters such as attack and release specifically influencing the active preset's character without altering its core programming. In Variable mode, these controls become fully programmable, offering greater flexibility for custom sounds, though changes revert upon selecting a preset. The interface integrates polyphonic and monophonic elements through a mode switch that routes signals to separate outputs—such as the polyphonic Mode channel and the monophonic Direct or VCF paths—enabling users to blend voices externally via a mixer for hybrid textures. The 71-note keyboard is velocity-sensitive, providing dynamic control over amplitude based on playing velocity for enhanced expression within presets. This design prioritizes velocity-based dynamics, aligning with the instrument's emphasis on sustained, orchestral-style polyphony.

Development and Production

Origins and Prototyping

The development of the Polymoog was spearheaded by Dr. David A. Luce, a researcher and Moog Music's Director of Engineering, beginning in the early . Motivated by the growing demand for polyphonic synthesizers that could surpass the limitations of monophonic instruments like the , Luce aimed to create a keyboard capable of playing multiple notes simultaneously with expressive control. This effort addressed the frustration among musicians who sought fuller, chordal capabilities in electronic instruments, building on Moog's earlier modular systems. Early prototyping centered on the Apollo, an experimental polyphonic system developed between 1972 and 1973 that featured limited voices using divide-down oscillator technology borrowed from organs. The Apollo served as a , evolving into the broader Constellation ensemble concept—a planned 1974 system integrating the polyphonic Apollo keyboard with the monophonic and for an organ-like setup. These prototypes highlighted initial polyphonic potential but revealed engineering hurdles, such as inconsistent note articulation due to shared filtering. Key innovations tested during this phase included a hybrid approach combining organ-style divide-down oscillators for pitch generation with filters and amplifiers for timbre shaping, later refined via custom Polycom integrated circuits. Prototypes faced significant reliability challenges, including oscillator synchronization problems and mechanical issues like loosening modulation components, which complicated consistent polyphonic performance. These tests informed the shift toward per-note control to mitigate paraphonic limitations observed in the Apollo. Musician input played a crucial role in refining polyphonic requirements, with providing feedback after using the Apollo prototype during Emerson, Lake & Palmer's 1973-1974 tours and recordings, emphasizing the need for better chord voicing and expression.

Release and Manufacturing

The Polymoog 203a was commercially released in 1975 by as the company's flagship polyphonic , priced at $5,295 and promoted as a pioneering fully polyphonic capable of true chordal synthesis with velocity sensitivity. Building briefly on earlier prototypes such as the Apollo, it marked a significant advancement in Moog's efforts to deliver accessible to musicians. The instrument's launch was supported by promotional materials, including demonstration videos featuring artists like and , which showcased its eight preset voices—such as Strings, , Organ, , , Vibes, , and —for orchestral emulation in studio settings. Manufacturing took place at Moog Music's facility in Williamsville, near , from 1975 to 1980, during which the 's elevated production costs were driven by bespoke components like the 71 custom Polycom chips, one per key, enabling its divide-down oscillator architecture. The design's intricacy, involving extensive wiring and modular circuitry, contributed to the high price tag and positioned the Polymoog as a premium studio tool rather than a portable stage instrument. Despite its innovative preset system and touch-sensitive 71-note keyboard, the encountered market challenges from competitors introducing more versatile polyphonics, such as the Oberheim Four-Voice released the same year, which offered greater user programmability. Production ceased in 1980 amid growing reliability concerns, including frequent failures in chip contacts, power supply instability, and sensitivity to transport that could misalign internal boards, rendering units prone to intermittent sound loss or loss of dynamics. These issues, exacerbated by the instrument's complex , led to a reputation for poor dependability, with later serial numbers (3900 and above) incorporating factory improvements but failing to fully resolve complaints. As the market shifted toward more stable analog polyphonics like the Sequential Circuits and eventually digital synthesizers in the early 1980s, Moog discontinued the line; however, warranty repairs and servicing extended into the decade, supporting existing owners through authorized channels.

Variants and Accessories

Polymoog 203a

The Polymoog 203a, released in 1975 and designated as model 203a, represented the original full-featured iteration of the Polymoog synthesizer series by . This instrument employed a modular architecture divided into distinct polyphonic and monophonic sections, enabling versatile sound generation, and weighed approximately 82 pounds (37 kg). Key to its design were expandable capabilities through optional modules that allowed independent processing of external audio sources, a 71-note velocity-sensitive Pratt & Read weighted keyboard, and an integrated monophonic oscillator bank for lead melodies featuring three voltage-controlled oscillators (VCOs) paired with a classic Moog ladder filter. The polyphonic section utilized divide-down oscillator technology for full 71-voice across eight factory presets, including strings, , and , while the monophonic section provided subtractive synthesis tools for expressive solos. At its debut, the Polymoog 203a carried a suggested retail price of $5,295, positioning it as a high-end instrument aimed primarily at professional recording studios and touring musicians seeking advanced polyphonic capabilities. Production was limited, with units often involving custom configurations to meet specific studio needs, contributing to its rarity today. In subsequent decades, owners frequently implemented aftermarket modifications, such as retrofits, to facilitate synchronization and control with contemporary digital setups and sequencers. The simplified successor, the Polymoog Keyboard 280a, omitted the monophonic section for broader accessibility.

Polymoog Keyboard 280a

The Polymoog Keyboard 280a, introduced in 1978, represented a streamlined iteration of the original Polymoog 203a , omitting the dedicated monophonic lead section to emphasize a keyboard-centric polyphonic instrument. Priced at $3,995, it targeted musicians seeking a more accessible entry into polyphonic synthesis without the full complexity of the earlier model. Key modifications included a 71-note velocity-sensitive keyboard and an expanded set of 14 presets, incorporating additions such as , String 2, Chorus Brass, and Rock Organ alongside the core sounds from the 203a like Strings 1, , and . Unlike its predecessor, the 280a employed fixed controls with minimal editing capabilities, removing programmable modes and user-defined parameters to favor straightforward preset selection and performance. Manufacturing of the 280a occurred from to , marking a brief production window compared to the longer run of the 203a, as Moog shifted focus amid evolving technologies. The model garnered praise for enhanced reliability stemming from its reduced circuitry and fewer failure points relative to the intricate 203a, making it somewhat more suitable for stage use despite its substantial weight. However, reviewers noted drawbacks in its constrained customization, limiting appeal for studio experimentation in favor of live preset-driven applications.

Pedal Controller

The Polypedal, model 285a, was an optional foot-operated accessory for the Polymoog synthesizer, introduced in 1978 to enhance low-end performance through hands-free control. This substantial unit featured a 13-note pedalboard for monophonic bass control, allowing the pedals to trigger and shape the synthesizer's bass sounds to produce deep, resonant tones. It connected to the main Polymoog via a proprietary multicable or multipin connector, allowing seamless integration for split keyboard setups where the pedalboard handled bass lines independently of the polyphonic upper sections. The design included two large sweep pedals for controlling volume, pitch bend, or filter cutoff frequency, two toggle switches for selecting sustain or trigger modes (single or multiple), three footswitches for destination routing and external triggering, and rear thumbwheels for fine-tuning pitch bend range. Functionally, the Polypedal provided control over bass sounds, allowing selection of bass sounds on the connected , such as a sub-octave tone reminiscent of the pedal synthesizer, enabling performers to emulate the low-end rumble of a pedal organ in live or studio settings. The 13 pedals were velocity-sensitive, translating foot pressure into dynamic volume and variations for expressive monophonic bass lines that could trigger the main synthesizer's lower range. This allowed for integrated performances, where the pedalboard's output could split from the keyboard's polyphonic voices, with controls like sustain extending notes and trigger modes enabling retriggering for rhythmic bass patterns. Additionally, the sweep pedals facilitated real-time modulation of synthesis parameters, including filter frequency and modulation depth, providing a "third hand" for musicians during complex arrangements. Production of the Polypedal was limited, with only a small number of units manufactured during its short run from 1978 to 1980, reflecting Moog Music's focus on specialized accessories amid the synthesizer's niche market. It was compatible with both the Polymoog 203a and 280a models, often bundled with high-end systems or sold separately to expand the instrument's organ-like capabilities. Due to its rarity and the era's analog component vulnerabilities, surviving units frequently require maintenance, such as recapping or connector repairs, to restore reliable operation in modern collections.

Musical Impact

Notable Users

Gary Numan prominently featured the Polymoog on his 1979 hit single "," utilizing its polyphonic strings and preset to create the track's distinctive icy, expansive lead lines and pads, which helped define early aesthetics. As a pioneer of new wave, Numan owned multiple units, including two 203a models and six 280a keyboards, integrating the instrument's preset-based into his solo debut album The Pleasure Principle for its lush, alien-like textures. Rick Wakeman, the keyboardist for progressive rock band Yes, employed the Polymoog as a primary instrument during their 1977–1979 tours, layering its orchestral presets to emulate string sections and add symphonic depth to live performances of complex compositions like those from albums Going for the One and Tormato. Known for his expansive keyboard rigs, Wakeman valued the Polymoog's ability to deliver rich, polyphonic swells in real-time, though he noted its experimental edge for unconventional sounds such as whale-like effects in studio work. Chick Corea integrated the Polymoog into his jazz fusion recordings around 1976, particularly on tracks from Return to Forever's Romantic Warrior, where he leveraged its harpsichord and string presets for timbral exploration and harmonic complexity in ensemble settings. As a featured demonstrator in the instrument's 1975 promotional film, Corea highlighted its polyphonic capabilities for blending acoustic-like tones with electronic innovation, influencing his shift toward synthesizer-driven fusion. Session musician Michael Boddicker extensively used the Polymoog in 1970s film scoring and studio work, including demonstrations at the 1975 Summer and contributions to soundtracks where its presets provided ethereal pads and effects. Featured alongside Corea and in the Polymoog's promotional materials, Boddicker appreciated its for session efficiency but often required multiple units due to reliability issues during intensive use. Larry Fast, under his Synergy project, incorporated the Polymoog across albums from 1975 to 1978, notably on Cords (1978), where most of the polyphonic parts featured its ambient textures and chordal capabilities for electronic classical fusions. Having received a unit, Fast drew inspiration from its dual-voice to craft intricate, atmospheric soundscapes that bridged analog experimentation and orchestral emulation. The Polymoog found favor among these artists for its pioneering polyphonic pads and preset emulations in , new wave, and genres, though its live deployment was often hampered by tuning instability and mechanical unreliability, necessitating backups or spares.

Legacy and Influence

The Polymoog's pioneering approach to analog marked a significant advancement in synthesizer technology during the 1970s, enabling true chordal performance without the limitations of earlier divide-down oscillators. This design influenced subsequent polyphonic instruments, such as the and Sequential Circuits , by demonstrating the potential of dedicated voice circuitry, while also exposing the complexities of analog implementation that spurred the industry's transition to more stable digital synthesizers in the . Technologies like Emu's digital scanning keyboards, which addressed similar polyphonic challenges, further built on these concepts to inspire modular expansions in and ARP systems. Culturally, the Polymoog left an indelible mark on 1970s and electronic music, with its distinctive string and organ presets appearing in recordings by bands like Genesis and Yes, cementing its role as a hallmark of the era's experimental soundscapes. Today, surviving units are prized as rare collectibles among vintage enthusiasts, with restored examples fetching between $5,000 and $8,000 on specialized marketplaces as of 2025, reflecting their historical significance despite production ceasing in 1980. The Polymoog's modern relevance persists through software emulations that capture its unique paraphonic architecture and preset timbres, such as Cherry Audio's Polymode plugin, which offers 32-voice and over 150 presets modeled after the original, and XILS-Lab's PolyM, providing faithful recreations for contemporary production. These tools enable its sounds in retro-inspired electronic music and film scores, bridging the gap between vintage hardware and digital workflows. However, the instrument's legacy is tempered by well-documented limitations, including a near 200% due to unreliable components, which demanded frequent repairs and underscored the engineering hurdles of analog . This high maintenance burden, combined with its premium pricing, exacerbated Moog Music's financial difficulties, contributing to the company's bankruptcy in 1987.

References

  1. https://rmc.library.cornell.edu/moog/polymoog.php
  2. https://www.soundonsound.com/reviews/moog-polymoog-retrozone
  3. https://inspiredbysound.net/the-polymoog/
  4. https://www.keithrobertmurray.com/articles/polymoog-rebuild.html
  5. https://www.vintagesynth.com/moog/polymoog-203a
  6. https://dmaudio.co.uk/product/moog-polymoog-keyboard-polyphonic-synth/
  7. http://www.analoguediehard.com/studio/keyboards/moog_polymoog/index.html
  8. https://www.perfectcircuit.com/signal/moog-polysynth-history
  9. https://www.encyclopedia.com/books/politics-and-business-magazines/moog-music-inc
  10. https://greatsynthesizers.com/en/review/moog-polymoog-synthesizer-an-auralesque-miracle/
  11. https://www.synthark.org/Moog/Polymoog-Synthesizer.html
  12. http://retrosynthads.blogspot.com/2010/02/moog-polymoog-synthesizer-contemporary.html
  13. https://reverb.com/item/87698672-moog-polymoog-203a-rare-midi-upgrade-vintage-rare-from-70s-professional-polyphonic-synthesizer-cleaned-full-checked
  14. https://synthtrax.net/index.php/Moog_Polymoog
  15. https://www.facebook.com/moogmusicinc/posts/the-polymoog-keyboard-1978-the-polymoog-keyboard-a-non-programmable-version-of-t/10156531150695102/
  16. https://www.smemmusic.ch/en/moog-model-285a-analog-polypedal-controller-0
  17. https://reverb.com/news/video-the-synth-sounds-of-gary-numan
  18. https://www.musicradar.com/news/gary-numan-pleasure-principle
  19. https://www.gearnews.com/electro-pop-origins-how-to-sound-like-gary-numan/
  20. https://www.newsweek.com/rick-wakeman-david-bowie-piano-man-yes-animal-rescue-interview-564924
  21. https://yesmusicpodcast.com/hammond-polymoog-double-mellotron-harpsichord-and-rmi-oh-my-531/
  22. https://artsandculture.google.com/story/discovering-moog-in-jazz-rock-fusion-moogseum/wAVhXMfWKFz7ZA?hl=en
  23. https://ranum.dk/synthesizer-heroes-chick-corea/
  24. https://www.youtube.com/watch?v=2Feat39SqXI
  25. https://moogfoundation.org/bob-moog-foundation-modular-legacy-namm-2015-michael-boddicker-modular-synthesizer/
  26. https://www.youtube.com/watch?v=Bxe4hqYk1mc
  27. https://electronicmusic.fandom.com/wiki/Fast%2C_Larry
  28. https://reverb.com/p/moog-polymoog
  29. https://reverb.com/item/72948096-moog-polymoog-280a-gary-numan-model-1978
  30. https://cherryaudio.com/products/polymode-synthesizer
  31. https://www.reverb.com/news/xils-lab-polym-synthesizer-reverb-software-pick-with-cpen
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