Moog Opus-3

Moog Opus-3 Image

The Opus-3 is one great little synth. It was designed by Herbert A. Deutsch from Hofstra University who originally nudged Dr. Robert Moog into building synthesizers and later served as director of sales & marketing for Moog Music. Herb also wrote the owner's manual. The sounds are broken up into 3 categories: Strings, Brass and Organ. Strings and Brass have their own separate VCF (filter) sections, the Organ section has none. The Opus-3 also has 2 sound outputs for an early stereo effect with panning! It's a colorful little synth with clearly laid out sliders and is fairly straight forward. It has classic analog Moog sound quality and is a great source of some string and lower octave techno-organ sounds. It is used by Stereolab, Kraftwerk, Zonetech, 808 State and The Rentals.

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26 Visitor comments
John from
April 28, 2013 @ 2:31 am
I love this Keyboard. The Organ, String and Brass sections are very flexible. It's got a real Moog meat and grit to it. Best part about it is the super wide +5/-4 pitch wheel. Get your slide on! :)
April 9, 2013 @ 10:27 am
It's 49 key polyphonic but not in the traditional discreet oscillator grouping fashion. It's a Divide Down architecture using a high frequency TOG similar to other string machines. But it has a discreet 4-pole low pass Moog filter, a 3 phase stereo chorus, and a very nice LFO with delay and vca fade in. Certainly it's just a single filter which can do legato triggering or re trigger on every key; not ideal for every style of playing.

Strong points are certainly the String chorus and high/low pass filter (does not resonate as it should not). Brass filter is excellent.
April 9, 2013 @ 6:21 am
Nothing moogy about this "synth". It's basically a string/brass-organ. It's not a synth, and it's not at all the polyphonic Moog in the way that you dream of it to be. Trust me.
martin 200
March 26, 2013 @ 1:47 pm
Not played or met one, but i would guess, if its like many other string synths, then it would be fully poly.
February 15, 2013 @ 5:29 pm
How many notes of polyphony? Everyone is talking about it but I do not see a number.
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  • 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.
  • Demos & Media
  • YouTube Thumbnail
    Moog Opus3 Demo
    by legionhwp

    Manual - Read or download the complete and original owner's manual for the Opus-3 (in .pdf format).

  • Specifications
  • Polyphony - YES
  • Oscillators - Strings, Brass, Organ
  • Memory - None
  • Filter - 2 VCF's (brass/strings) Hi/Low/Band pass
  • VCA - Level and Panning for each instrument
  • Keyboard - 49 keys
  • Arpeg/Seq - NO
  • Control - None
  • Date Produced - 1980
  • Resources & Credits
  • Images from

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