Sequential Pro-One

We are Brokering this vintage instrument for and on behalf of our UK client.

Came into stock: 

October 2021.

Service Status: 

Full service by KSR was carried out in late October 2021, so this Pro-One is ready for sale & shipping/collection.


It must be true that time travel is possible because we have a vintage Pro-one sat here that looks like i’s just come from the Sequential Circuits production line in 

The Pro-One is a superb mono-synth, utilising the fabled Curtis CEM chip technology, like its bigger brother, the Prophet 5. A really great sounding vintage analogue synth and very flexible modulation routing capability and wonderful built-in arpeggio & 40 note sequencer. 

This Pro-One has come to us from our UK client who has owned it since new, having bought it in the early 1980s, so only one owner!  It comes with its original retail packaging and has a pristine copy of the owners manual.  The condition of the Pro-One can only be described as mint.  It’s immaculate, unmarked.

What can we add to the huge body of praise that you can find online for this super little mono-synths, it’s got heart, full of character, punchy, versatile…perfect.

A good friend of ours, Theo Bloderer, runs an excellent online magazine called Great Synthesizers (, and he ran a really super article dedicated to the Pro-one back in August 2012.  You can read that article by clicking the link below:

To answer the obligatory question on these models, yes, this is (J-Wire) version, most were.  KSR has just fully serviced the synth, which included a new set of neoprene keyboard bushes, full calibration, re-cap of PSU, deep-clean of all pots, switches etc.  The synth was clean and in top condition, but age still plays its part in needing to maintain these instruments, so most of the servicing was minimal to ensure furniture continuity.  The wood end-cheeks were pristine, so di not need any treatment. 

As you can see from the pictures, this Pro-One looks like new. We made a short video of the Pro-One playing a sequence we programmed in, just for fun really and to show it’s a happy machine and working 100% perfectly, so please click the link below to watch it in action:

This Pro-One operates on either US110V or UK/EU 220~240V as it has a switchable power supply, but a UK 3-pin is currently fitted to the mains cable.

As the instrument is being Brokered through RL Music, it will be sold with a full 3-month warranty and we can ship worldwide.

Packing & Shipping: 

We can ship this instrument worldwide, although the packing, shipping & insurance costs are not included in the sale price below, so are subject to quotation.  There may be some short delays in getting the packaging materials produced for shipping as they are custom ordered for the specific dimensions of each instrument.  We are happy to discuss your requirements so please email us if you have any questions on the logistics and/or need a quote.

Sales Price: 

£1,890 GBP

As this is a brokered sale, VAT is not applicable on the sale of this Pro-One to UK buyers, however, packing & shipping/insurance is subject to VAT @ 20% should you need the goods shipped to you.


This Pro-One is now SOLD – this listing was updated on 4th November 2021 @ 16:23.

Click on the thumbnail for a higher resolution photo of the actual Pro-One for sale.  If you require specific pictures not already featured of the instrument then please contact us so we can try and accommodate your request but there may be a short delay in getting this done for you as the instrument is currently in secure storage.