Moog Polymoog

Moog Polymoog Image

Polymoog Synthesizer 203a

The Polymoog is the descendant of an ambitious project by Moog Music to create a large ensemble system called the Constellation. It was to include two keyboard synthesizers, the polyphonic Apollo and monophonic Lyra, and the Taurus foot pedalboard synthesizer. Although the Constellation project never made it to production, the Taurus pedalboard was released on its own, while the "Apollo Polyphonic Synthesizer" went on to become the Polymoog. It is also noteworthy that the Apollo/Polymoog project did not directly involve Bob Moog and was instead mostly designed by Dave Luce at Moog Music.

The Polymoog (model 203a) is a fully polyphonic preset-based synthesizer released in 1975. Its eight preset sounds consist of Strings, Piano, Organ, Harpsichord, Funk, Clavi, Vibes and Brass. There is also a Var (Variation) mode that allows any one of the preset sounds to be fully modified into unique and wild analog sounds using all of the available synthesis parameters on board. There’s a genuine Moog ladder filter inside with modulation, keyboard tracking and lots of LFO modulation sources. The Polymoog features a full 71-key, velocity sensitive Pratt & Read weighted keyboard that can be split into three sections, each with independent volume sliders. There is a 3-band EQ, sample-and-hold, pitch controller ribbon and a full set of envelope controls. What you won’t find, however, is patch memory or MIDI control.

Moog Polymoog Keyboard 280a

Polymoog Keyboard 280a

The Polymoog 203a was originally known as the Polymoog Keyboard. In 1978, a newer, cheaper and more simplified model was released, the Polymoog Keyboard 280a. The original model 203a was thus re-named the Polymoog Synthesizer. The 280a model has more preset sounds (fourteen of them) but eliminated most of the editing functions that make the original 203a so much more flexible. The 280a model’s new preset sounds included Vox Humana, Strings 2, Electric and Honky Tonk pianos, Chorus Brass and a Rock Organ. Because programming is so limited you’re pretty much stuck with the presets. Fortunately the Vox Humana preset is a wonderful sound (used famously by Gary Numan). Editing is reduced to volume, tuning, hi-pass filtering, and basic LFO features. The 280a model can easily be identified by the name ‘Polymoog Keyboard’ printed where sliders and knobs would exist on the 203a model.

Moog Polymoog Pedal 285a

Polypedal Controller 285a

An optional Polypedal board (model 285a) allows for external control of the pitch, filter, and volume via two large black foot pedals. Sustain and trigger mode can be controlled by two smaller silver foot pedals, and external sync of the Polymoog can also be controlled.

It should be noted that the Polymoogs are not true poly synths in the traditional sense. They use a ‘divide-down’ circuitry arrangement similar to certain string synths, combo organs, etc. This allows them to be fully polyphonic across the entire range of the 71-note keyboard. Sadly, the Polymoog is rather unreliable and prone to breakdown; used specimens are often problematic when left unserviced. Unfortunately, their complexity makes them difficult to service and even more difficult to find a qualified technician. By the way, the large amount of real-estate on the top of the Polymoog was designed that way as a place to put your Minimoog (or other synthesizers) on top of it. Don’t worry, it can take the weight, as the Polymoog itself weighs a whopping 82 pounds!

Unique among Moog’s lineup, the Polymoog is not at all like the Minimoog or any of the other mono-synths Moog has become famous for. Instead, it was designed to complement Moog’s monophonic synthesizers. It’s a unique and finicky product, the brain child of David Luce instead of Dr. Bob Moog himself. But like all Moog products, this isn’t an ordinary instrument — it’s the Polymoog and it sounds fantastic for what it is. Polymoog’s have been used by Chick Corea, Blondie, Keith Emerson, Devo, Gary Numan, Prince, Herbie Hancock, Richard Tandy of ELO, Patrick Moraz, Rush, Larry Fast, Wendy Carlos, Tony Banks, Kraftwerk, Geoff Downes, Jimmy Edgar, Freddy Fresh, and Rick Wakeman of Yes.

Lookup Moog Polymoog Prices

The link above will take you to an eBay search for this synth to see active listings with more images, specs and information. If you don't find it there, try looking in our forum marketplace. Our marketplace gets thousands of visits every week so make sure to check back often if you want to buy or sell a synth.

Related forum topics


Are you looking to buy or sell a Moog Polymoog? Post an ad in Gear For Sale or a request in Gear Wanted. For spare parts and repair services check out Gear Services & Other Goods. Our forums also has a Buyer’s Guide section where you can ask for advice on buying synthesizers.

47 Visitor comments
Jim H
June 4, 2013 @ 8:55 pm
A truly awesome vintage instrument! Excellent article & thanks to Synthpro for posting the demo videos. I have a fixer-upper 203a and I'm now looking forward to bringing it back to life more than ever. When I opened it up to inspect it, the rats-nest wiring and row-upon-row of circuit cards reminded me a bit of a Farfisa Combo Compact organ that I once owned. If this were redesigned today, I bet they'd fit it on a single VLSI card.
February 14, 2013 @ 5:46 pm
Unreliable, yes, and the keyboard action is not great, but the the Polymoog has lots and lots of character. Totally unique sounding - there is really nothing like it, and it's therefore quite easy to spot in a song. It's the only polyphonic Moog I really like.
February 10, 2013 @ 8:12 pm
Lovely sounding synth..but utterly unrealible. I borrowed a friends and just moving it in the car half of the presets dissapeared! Whoops
December 26, 2012 @ 11:21 pm
Once again I have to babble on about this truely unique and glorious sounding synthesizer.
True, they are as so much tempermental that if you even look at them funny you might have one of your polycards dislodged and become in-audible. Or if you loan it out to a friend, it may return to you with only square-waves working and the Sawtooth-waves completely M.I.A. Only to swiftly re-appear when you move it from one place to another! :) Yet... it sounds so frightfully full of life! One of a kind Analogue BLISS!

. dWQ&index=1
Dejan Djordjevic
December 14, 2012 @ 9:55 am
I made polyphonic playing same synthlines2x,each on a track of 24track 2"tape,adj.tapespeed on analogue tape for natural chorus+wider stereoimage,Billy used his finger on tapereel,slowed it down to create wider stereoimage.I lived in W-Germany,got my 1975 model Polymoog from Bertram Musik Freiburg when I started composing my 1st works 19/11/1979,I was14,slept w/Polymoog,fell asleep w/my headphones on:And I played most polysynths on ULTRAVOX!! iNTiMATE COLLECTiON.Sir Dejan Djordjevic,Basement Flat Rear,189 Sandgate Rd,Folkestone,Kent,CT202HJ,UK.
VSE Rating

It’s Good

User Rating

Rated 3.82 (320 Votes)

  • Check Price
  • The link above will take you to an eBay search for this synth to see active listings. If you don't find it there, try looking in our forum marketplace or post a wanted classified.
  • Specifications
  • Preset Sounds - 203a: Strings, Piano, Organ, Harpsichord, Funk, Clavi, Vibes, and Brass.
    280a model adds: Vox Humana, Strings 2, Electric and Honky Tonk Pianos, Chorus Brass and a Rock Organ
  • Polyphony - 71 notes
  • Oscillators - 2 VCO’s with sawtooth and pulse/square waveforms and pulse-width modulation
  • LFO - Rate, Amount Attack
  • Filter - Highpass, Lowpass (203a model only), 3-band EQ
  • Memory - Model 203a: 8 Preset + 1 User
    Model 280a: 14 presets
  • Keyboard - 71 keys (velocity sensitive)
  • Control - CV/Gate
  • Weight - 82 pounds (37 Kg)
  • MSRP - approx. $5,000
  • Date Produced - 1975-80

Errors or Corrections? Send them here.