Pricing and availability
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Price
Average Price: $2,000
High-end/Boutique
$500
$1501+
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Budget
Standard
High-end
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Description
Introducing the Sequential Circuits Pro One Synthesizer, a powerful monophonic piece of kit from the golden era of analogue synthesizers. With its dual voltage-controlled oscillators (VCO), it's a master of fat, warm, and expressive sounds. The Pro One is not just a synth, but a creative powerhouse with its built-in 4-pole low-pass filter and Voltage Controlled Amplifier (VCA). The synthesizer also rocks an arpeggiator and sequencer, giving musicians a wide palette to work with. Sprinkle in CV/Gate controls, and you've got the perfect companion for your vintage or modular setup.
Key Features:
- Monophonic synthesizer with 2 voltage-controlled oscillators
- Built-in 4-pole low-pass filter and VCA
- Features an arpeggiator and sequencer
- CV/Gate controls for modular setup compatibility
- Rich, warm, and expressive analogue sounds
- Classically designed for vintage aesthetic appeal
Product specs
| Brand | Sequential |
| Model | Pro-One 37-Key Monophonic Synthesizer |
| Finish | Black |
| Year | 1981 - 1984 |
| Made In | United States |
| Categories | Analog Synths, Keyboard Synths |
| Analog / Digital | Analog |
| Key Size | Slim |
| Keyboard Action | Synth Action |
| Number of Keys | 37 Keys |
| Polyphony | 1 Voice |
FAQs
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Is the Sequential Circuits Pro One synthesizer polyphonic or monophonic?
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The Sequential Circuits Pro One is a monophonic synthesizer, meaning it can produce one note at a time, which is ideal for basslines and lead sounds.
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What kind of sound can I expect from the Sequential Circuits Pro One?
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The Pro One is known for its rich, analog sound with a classic, warm tone ideal for genres like electronic, synth-pop, and new wave.
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Does the Sequential Circuits Pro One have MIDI connectivity?
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The original Sequential Circuits Pro One does not have MIDI connectivity as it was produced before MIDI was standardized, but it can be modified to include MIDI capability.
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What is the keyboard action like on the Sequential Circuits Pro One?
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The Pro One features a synth action keyboard with 37 slim keys, providing a responsive and fast-playing experience suitable for synth leads and basslines.
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How does the Sequential Circuits Pro One compare to the Prophet-5?
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While the Pro One is a monophonic synthesizer, the Prophet-5 is polyphonic. The Pro One shares a similar analog sound character but is more focused on single-note performance.
Videos
Telekom Electronic Beats TV
Mathew Jonson Presents His Synthesizer Favourites: Sequential Pro One (Electronic Beats TV)
Reviews
PROS
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Unmatched sound quality, bridges 70s edge and 80s analog cleanliness
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Powerful sequencer and modulation options
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Exceptional for tight, punchy bass and snappy arpeggios
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Versatile sound creation, from fat bass to experimental atmospheres
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Stable chipset design, solid tuning
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Offers a wide range of CV/Gate inputs and outputs
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Can produce a variety of sounds including deep subs and electro arps
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Simple yet inspiring sequencer and arpeggiator
CONS
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High resale price may not justify the value compared to alternatives
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Lack of MIDI without an upgrade
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Limited production makes it rare and expensive
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Prone to key triggering issues (double or triple triggering)
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When a chip fails, repair or replacement can be challenging
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Sequential Circuits Pro One Synthesizer.
Setup and maintenance
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The power supply capacitors should be replaced to prevent tantalum cap failure, which can ruin the PCB.
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Bent support arms under keys can often be repositioned to fix non-working keys.
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Older Pro-One models use Pratt Reed keyboards; newer ones use rubber contacts. Both are repairable, but a full Fatar keybed replacement is often recommended for better performance.
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Mods and upgrades
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Fatar keybed replacements are recommended for improved playability and future resale value.
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User experience
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The membrane-style keybed can have broken keys and is challenging to service.
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Features and functionality
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The Pro-One allows for manual parameter manipulation, unlike preset-only synths like the ARP Soloist.
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Comparisons
Value and pricing
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Original Pro-One units can sell for over $1,000 on platforms like eBay, making a $520 purchase potentially profitable after repairs.
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Critic Reviews
5.0 out of 5
Based on 7 Reviews and 24 Ratings
67
Excellent synthesizer in it's own right.... But.... Not a bit like the ARP Oddysey
Love the modulation mixer. It's not been done on that many synthesizers. It almost gives the impression on a modular - without all the hassle of cables and sockets that would eventually start to crackle and go intermittently open circuit.
Pros - nice and stable thanks to a complete chipset designed just for synthesizers designs. Cons - When one of the chips goes down, which, to be fair would be a long time ago, the whole instrument is pretty much scrap.
Unless a good engineer could redesign that specific section. I used to keep all schematics of these sort of mods. I do believe that the chipsets for these synthesizers have once again been brought back to life and the foundries have started up again. This will be.great for the second hand market once again. To own any synthesizers of this age, you either need to know a very good engineer, or you would need to have the knowledge to modify these beasties. Come to think of it, to own a studio and engineer it yourself, you (should be) just the sort of engineer to keep one of these of these on it's feet.
the only monosynth you need if you cant find or afford an obie two voice, ob1, kobol, syrinx
does a 303, does a deep sub, does electro arps/seqeuncing, does moogy, does arpy, does the monopoly chord memory sub octave sound, plus its great at thunder and zaps. pretty solid tuning, lots of cv/gate in and outs with trigger. fairly robust and not finicky. a solid synth, i guess thats why theyre now $1500-2000 cdn/us. in case you didn't know, millenials...we (gen-x) old timers used to pay 350-600 for these back in the ancient olden days of 1993.
83
One of the absolute best
This is a marvellous synthesizer. Probably the best monosynth ever made after the Minimoog. It can handle pretty much anything, from smooth moogy leads to filthy bass and extreme effects. Everything you dial in sounds good, and the sequencer and arp are simple but inspiring. If you need a monosynth and can't afford a Minimoog, this is the one to get.
91
All in one synth for everything
Crappy keys suffering from double or triple triggering but soundwise it could be the only machine you ever need because it delivers any basic sound in outstanding quality. Fast envelopes, a strong filter which opens up to the highest highs and resonates over the entire audio spectrum, very flexible modulations, sync, fm (with a character similar to my ARP2600) and lots of other goodies. Vince Clarke was right to choose it as one of his favorite machines.
420
My favourite synth
this is my favourite synth in my collection, it produces some wicked bass sounds and is a right staple within my collection. I wish I had the the pro 5, but I couldn't afford it last time I saw one on ebay. I have the pro 5 VST which is pretty cool, but the sound is very much different from the synthesizer in the flesh! .
41029
ah the pro1, snappiest envelopes ever
1264
Favorite Monosynth
I had it for a long time and then sold it like a chump. I regret everything. I need to get another but the price is so much higher now. Maybe the clone will be ok, maybe not. Maybe I need to get another one. I still cry every night missing my Pro One.
1963
Pro-1
At the studio we use it mostly as a bass synth but also for arpeggios.
Artist usage
Add artist
At that moment I had just got a 606 drum machine and because the 606 and 303 had been made as companion pieces, I thought it would be a wonderful idea just to lock myself away with those two pieces and some others - perhaps a Juno 106, a 101 and probably some type of sequential circuit Pro-1 or 6-track. I would kinda lock myself away with just those things and record as much music possible over a couple of days with that limited instrumentation.
Howard jones Westword interview (October 12 2011)
" I actually had two of those and a Juno 6 and an 808 drum machine. Then a Pro One"
From the "Tech Talk" section of the old KMFDM website:
Question (Johnny): How might one achieve a sound such as the synth bass on "Ready To Blow"? I'm assuming you are just using one oscillator with some portamento and no resonance.
Answer (Sascha): That is correct, I used my Sequential Pro-1 for it, the internal sequencer is sweeeet!
"Back then I was also using a Sequential Pro-One keyboard, a Roland RS-09 string synth, an ARP Odyssey and an ARP Axxe. And I had a Boss DR-55 and then an 808, obviously, when they first came out."
In a studio tour video by MusicRadar Tech, Alex Metric showcases his Sequential Circuits Pro One Synthesizer.
What kind of gear did you use at the time?
R: “Caustic” was a pretty minimal set up. All we used was the Atari, an Akai S1000 and S950, a Minimoog, Micromoog, Pro One and a Kawai K4 for strings… Less is more I’m starting to think! We did have a couple disks of Adrian Sherwood drums and Yello bass sounds for the Akai that were used a lot.
"The Pro-One is one of those instruments, they're like a woman. You can't understand them, there's like 1,000 knobs, and it cries every time you touch it," she said as the temperamental Pro-One faltered on a song."
"I'm proud to be a girl! And I'm proud to play an instrument that behaves like an [effing] woman every show!" - Emily Haines
Then after ordering the audience to tell the Pro-One they loved it, in unison, Metric launched into "Poster of a Girl."
Madonna Wayne Gacy purchased and used the Sequential Circuits Pro One Synthesizer as his first keyboard with the band, according to Mansonwiki.
K.Flay is seen using the Sequential Circuits Pro One Synthesizer in a photo shared on her official Facebook page.
Album Usage
The Sequential Circuits Pro One Synthesizer has been featured on the following albums:
Arseholes, Liars, and Electronic Pioneers
Paranoid London (2024)
Doctor! Doctor!
Thompson Twins (2024)
T69 collapse
Aphex Twin (2018)
Collapse EP
Aphex Twin (2018)
Only You
Yazoo (2018)
Apocalypse Live
Material (2017)
Passion
Para One (2012)
Lonerism
Tame Impala & Kevin Parker (2012)
Bruise (Deluxe)
Assemblage 23 (2012)
Hot Mess
Chromeo (2011)
Business Casual
Chromeo (2010)
Don't Turn the Lights On
Chromeo (2010)
Compass
Assemblage 23 (2009)
Old World Underground, Where Are You Now?
Metric (2003)
How I Long To Feel That Summer In My Heart
Gorky's Zygotic Mynci (2001)
The Blue Trees
Gorky's Zygotic Mynci (2000)
Caustic Grip
Front Line Assembly (1990)
Hello America (2019 Remaster)
The Cassandra Complex (1986)
Journeys out of the Body
Steve Jolliffe (1983)
Upstairs At Eric's
Yazoo (1982)
Sunlight
Herbie Hancock (1978)
Genre Usage
Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.
Used With
Based on how musicians on Equipboard use Sequential Circuits Pro One Synthesizer, it is most commonly used with the following gear.
Community setups
Show yoursSimilar
Add recommendation2 alternative and related items for Sequential Circuits Pro One Synthesizer, curated by the Equipboard community.
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Repro is U-He's very detailed and fully-featured software emulation of the Sequential Circuits Pro One.
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