“Legendary analogue synthesizer from 1981. Without a shadow of doubt the most powerful mono synth ever produced. This thing is completely devastating for basslines, but also excels at leads, drones, percussive sounds and all kinds of other complete madness. A truly wild and amazing instrument. The real deal – none of this modern clone/reproduction business. The synth was serviced a couple pf years ago and is working spot on. There is one control knob (Osc A volume) missing as can be seen in the photos, but the actual potentiometer still functions perfectly and can be used like normal. There were none available at the time the unit was serviced, but they are readily available from a few sources at the moment and cost just under £10. The unit is in really nice overall condition cosmetically. There’s a hairline mark on the casing just to the left of the pitch/mod wheel as can be seen in the photos but this is superficial and has no affect on functionality. Wooden end cheeks in really nice condition. All in all for a 40 year old unit this is a really fine example.”
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Sequential Circuits Pro One
“Legendary analogue synthesizer from 1981. Without a shadow of doubt the most powerful mono synth ever produced. This thing is completely devastating for basslines, but also excels at leads, drones, percussive sounds and all kinds of other complete madness. A truly wild and amazing instrument. The real deal – none of this modern clone/reproduction business. The synth was serviced a couple pf years ago and is working spot on. There is one control knob (Osc A volume) missing as can be seen in the photos, but the actual potentiometer still functions perfectly and can be used like normal. ” 
“Great shape, completely re-capped and new internal battery in 2019, Forge (by Anvil) hard case with perfect fit and good foam, original manual (worn, see pics), gligli modded and will also include the original Z80 chip.
“Sequential Circuits Prophet 5 Rev 3.2 MIDI Signed by Greg Hawkes of ‘The Cars’.” 
“If you’re looking, you know. In great working condition, in great physical condition.
“Sequential Circuits TOM Drum Machine. Near mint condition and perfect working order in original box with original power supply, manuals, plus 1 original sound cartridge (Latin Percussion) and 2 reissue cartridges (Contemporary & 808). This is an awesome 80s drum machine, very ‘Prince’, sounds massive and is definitely a sleeper to my mind – I’ve owned plenty of classic drum machines and this has been one of my favourites. Super advanced for its time, it can be used to great effect triggering other devices, has midi, etc. and 99 pattern patches. ” 
“This one is in excellent cosmetic condition and working 100%. It has just been serviced and with a lot of restoration. It is ready to be played and needs nothing! I doubt there is another here on Ebay that is as nice cosmetically and that has had the same amount of restoration. Please mail with any questions. Not sold as-is! California residents to pay state tax. Shipping to most countries!” 
“Comes with a new 0.5 OS rom chip. Some scratches on front panel. Select pattern function button and keypad buttons are a little wonky but do work. The arrows on the key pad work fine. Also the tambourine pad seems to not be working. All sounds work via midi with no issues.” 
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“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.
“This unit has been fully serviced and is in perfect working order. We replaced the original display with one that’s much easier to read in the light as well as in the dark. Sale includes power cord and Sequential box. ” 
“Sequential Circuits Pro One
“SEQUENTIAL CIRCUITS PROPHET VS SYNTHESIZER :
“Prophet 5 V 3.3 synthesizer with original midi, original flight case, original bound manual, original bound service manual, in exceptionally good condition as per photos. The keyboard has been completely rebushed and all relevant capacitors replaced by Ben at Cyberwave EMS who is an expert in Prophets (he owns a Rev 2). Have you ever seen a P5 keyboard as even as that?! 🙂 It plays perfectly and as new. As you can see the condition is superb – the wood is beautiful and has one mark on the left hand edge as pointed out in the photos, which goes completely unnoticed in my studio. I’m a bit of a perfectionist with classic analogues (you can see a few, but the others, including my Jupiter 8 are also in top notch fettle) and I absolutely don’t notice the chip, which I considered having looked at by a French polisher, but haven’t as it just isn’t obvious in the studio. Ben knows this synth well as he has brought it up to top condition and serviced it for many more years of good service. I have had it dump its memory, but Ben has gone through it thoroughly and found nothing to be an issue and I had tape back ups. Speaking of the latter, I have all the original banks, but one of my own also in there at the moment which I can remove if you wish (but they’re good sounds!). Ben informs me that the Sequential factory midi can sometimes cause this if the buffer gets overloaded and his suggestion was that you could avoid using it, but I have anyway and it’s fine. Even better with CV. :). If you’re wondering why its so well priced for such a collector package, it’s because it’s priced to sell. I buy a lot of synths and know that the prices some people are waiting for is unrealistic . However, I’m not open to stupid offers and I’m not even convinced that I really want to let this one go, but I have the Pro One and my poly duties are waaaay covered by my other synths. Can you have too much Sequential? Probably not, but I’m not a collector and I use the Pro One more right now.” 
“Sequential Circuits Prophet-600 polyphonic synthesizer
“Function: 10/10, Cosmetic: 9/10
“For sale is a vintage Sequential Circuits Six-Trak. The Sequential Circuits Six-Trak Polyphonic Synthesizer may be labelled as a “beginner model” by the company, but the features and functionality make it a prime choice for any synth enthusiast. Built with 48 velocity-sensitive keys and the same Curtis circuitry found in the company’s more expensive models. This Six-Trak exhibits some heavy cosmetic wear like rusting on the chassis and scratches on the side wooden panels. It’s not in the prettiest cosmetic shape, but it is completely functional and works perfectly.” 
“Sequential Circuits Prophet VS + 4 Cartridges
“Rare 1984 Sequential Circuits Max 620 Analog Synthesizer-Good Shape 80s MIDI. Condition is “Used”.” 
“PHYSICAL CONDITION: Excellent – Some light wear from normal use, some near the edges of the knobs, and a few small dings just above the filter section. Otherwise this P5 is in remarkable shape. Keys and controls are all fully intact and in excellent shape. Both wheels and all I/O are also in fantastic condition. Overall condition is excellent. WORKING CONDITION: Excellent – Fresh from servicing, with a new key bed and thoroughly cleaned pots, this beauty is in perfect working order from top to bottom and sounds truly amazing! Also has a rebuilt power supply! All control knobs, all keys, all buttons, and all LEDs are working perfectly. Overall working condition is excellent. Please click on “Item Description” for more details and photos.” 
“Sequential Circuits Pro One J-Wire Version. Condition is “Used”.” 
” you are bidding on a used and serviced Sequential Circuits Tom Drum machine Model 420
“Sequential Circuits Prophet 600 GliGli modded Keyboard Synthesizer. Condition is Used.