Sequential Circuits Pro One

Sequential Pro One Image

The Sequential Pro One is a wicked little monosynth! It comes from the same period and genre as the Roland SH-101 and Moog Prodigy. The Pro One was basically Sequential's attempt at taking their legendary Prophet 5 poly-synth and packing it into a compact, inexpensive, monophonic analog synth! It has two VCOs, a great 4-pole lowpass filter, two ADSR envelopes (one for filter), and a compact three-octave keyboard. With a Pro-One, you can easily create punchy analog bass-lines and leads or quirky analog synth effects.

The Pro One is an extremely flexible synth with lots of modulation possibilities (ie: the filter, VCO B and LFO can modulate VCO A or B frequencies or pulse widths, or the VCF). There's also an onboard sequencer, something common on many Sequential synths but not often found on other monosynths of the time. It is very basic, however, storing only two patterns and up to 40 notes max. Also, only pitch info is recorded (and in step time only); you can not assign a note duration to any notes. So it's basically a short melodic sketch-pad...but useful. Also onboard is an arpeggiator which has UP and UP/DOWN patterns.

Sequential Pro One Image

The Pro One is relatively simple and intuitive to use, fun, educational and responsible for some of the coolest and hardest basslines in electronic music today! It is used by Hardfloor, Überzone, the Prodigy, Cirrus, Fluke, Depeche Mode, Download, Banco De Gaia, Vince Clarke, New Order, Freddy Fresh, Mouse on Mars, Prince, Soft Cell, Richard Barbieri and Sigue Sigue Sputnik.

But since you can't always find one (about 10,000 were produced), or one that works properly... Wine Country Sequential has come up with a solution! WCS has been servicing old Sequential gear for years, as well as selling repair parts, etc. They have developed the Pro One Software Synthesizer Plug-In, an awesome replica of the original Pro One, both in look and sound! It has some added features and is an incredible way to easily add the sound of the Pro One to your music!

Check Sequential Circuits Pro One Prices on eBay

The link above will take you to a 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.

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Are you looking to buy or sell a Sequential Circuits Pro One? 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.

68 Visitor comments
jonathan
February 14, 2012 @ 6:20 pm
hi i bought a pro one its in mint condition, my question is, is the audio out
stereo or mono it just i have my stereo speekers connected to it with a stereo
cable but only one speaker works, theres nothing wrong with the speakers
because they work fine on my other synths ??
Roh
December 29, 2011 @ 7:28 am
Amazing synth - killer. Got mine at a steal, I was very lucky!! Goes head to head with a Mini, IMHO.
visceralvoids
September 12, 2011 @ 5:02 pm
Used by Dwayne Goettel (RIP)/Skinny Puppy. Has some awesome modulation abilities for a monosynth. More synths should have a drone/hold mode like the Pro One.
Jay
April 24, 2011 @ 2:53 am
Phil, thanks for your reply. I actually bought the Mopho Keyboard a few weeks ago, and absolutely love it... I think it sounds amazing! It has the same Curtis filter as the old Sequential stuff and that can easily be heard!
VSE says it well: "It's tempting to make the Pro-One comparison, but it's much more accurate to think of the Mopho as a descendant rather than a reproduction. It shares the same spirit and function, but has a soul and personality that is all its own."
If I do stumple across a cheap Pro-One at some point I might still get it... but I'm definately not in a hurry now! :-)
phil
April 22, 2011 @ 3:54 pm
Jay, I can tell you that the pro1 is better sounding that the mopho,I own a prophet 5 and a pro1 and I played in a friend's studio both the prophet 08 and the mopho,I can say that both are very good sounding synth and if you decide to buy one of this surely you ll be satisfacted...but I don t know if after some month you ll still be happy... I had fun for a little time trying mopho becose it's simple,with a lot of memories and sounds good but when I came back to my studio and I switched on the prophet5 and the pro1 I realized.... pro1 sounds better than mopho...far better..wait for a pro1!!
 
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  • Check Prices on eBay
  • The link above will take you to a 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
  • Polyphony - Monophonic
  • Oscillators - 2 VCOs (CEM-3340 chips): : VCO A saw/pulse, VCO B saw/tri/pulse, Noise
  • LFO - saw, tri, pulse
  • Filter - CEM-3320 Filter chips: 4-pole lowpass with Cutoff, Resonance, ADSR Envelope, Keyboard Tracking
  • VCA - ADSR Env
  • Keyboard - 36 keys
  • Arpeg/Seq - Arepg: UP, UP/DOWN patterns, Latch mode; SEQUENCER: 2 patterns of pitch info only, 40 note capacity.
  • Control - CV/GATE
  • Date Produced - 1981 - 1984

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