🔥Sequential Circuits Pro-One (with MIDI)🎹 & Custom Knobs

Note: links to listings are affiliate links for which the site may be compensated.
video upload by Ephraim Nowak

via this Reverb listing

"Original SCI Pro-One with MTG Turbo MIDI kit installed!

Cosmetically, it's seen better days, but sonically - it works. Has been stored for two years and some key contacts needed playing after that time. It's time for a new home where it's appreciated!

The instrument was serviced in 2023 by the legendary Greg Montalbano of Analog Synth Service in Oakland.

Cleaned, tuned & scaled. Assessment: MTG MIDI unit works, but the CV option was incorrectly soldered, and the DAC for the optional CVs doesn't work. Upgraded fixed power cord to removable IEC power socket"

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Exploring the E&MM Spectrum DIY Synthesiser, 1981

video upload by Reuben Jones

"Another video on the E&MM Spectrum Synthesiser. Not very musical, but the Spectrum is a quite unpredictable and unruly, and mine needs a proper service/calibration.

The Spectrum is architecturally similar to the Sequential Circuits Pro~One, but even the Pro~One's famed modulation matrix isn't enough to match the weirdness of the Spectrum.

The full build manual can be read here: https://www.muzines.co.uk/articles/th..."

Sequential Circuits Pro One (100)

Note: links to listings are affiliate links for which the site may be compensated.

via this Vemia listing

Click the auction link on top when you get there for additional listings.

"Original Sequential Circuits Pro-One synthesizer in very good condition. Only one owner since new, the Norwegian synth band Fra Lippo Lippi. The synth is considered by many as one of the best mono synths ever. It is in original form, only the power had has an upgrade (new caps), and it has been cleaned inside and outside, fully calibrated and ready for use. All knobs are original, and all functions work as they should. One slider knob has ever so slightly contacts problems, but it has been cleaned and re-lubricated, so it works fine, but care might be needed. Or it could be changed to a new one. We choose not to do that to keep the complete synth original. The keyboard is original too, and might need new bushings if you are a keyboard player. All interfaces work, and of course it sounds brilliantly!"

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Sequential Circuits Pro-One Analog Monophonic Synthesizer “refurbished” SN 2509

Note: links to listings are affiliate links for which the site may be compensated.

via this eBay listing

"Just serviced by pro Bay Area tech.

What’s done:

glue mod that changes the angle of the j wires, makes it work better

new keyboard connector with new female plug

New AC cable

Recapped power supply

Repaired OSCILLATOR 1

New voltage regulator

All new 37 keyboard rubber bushing kit from Syntaur

Works and sounds awesome!"

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Roland TR-606, Roland SH-09, Korg Polysix and Sequential Circuits Pro-One

video upload by Benjamin Dehli

"A short demo featuring a drum machine and synthesizers from the early 80's.

Instruments:
Roland TR-606 (drums)
Roland SH-09 (bass)
Korg Polysix (chords)
Sequential Circuits Pro-One (arpeggios)

Effects:
Alex Franklinos Stereo Transformer Saturator
Boss CE-1 Chorus Ensemble
Chase Bliss Audio & Meris CXM 1978
DIY Recording Equipment G Bus VCA Compressor
Electro-Harmonix Deluxe Memory Man
Fulltone Tube Tape Echo
Hairball Audio FET/RACK Revision D
Handsome Audio Zulu
Roland Dimension D SDD-320
Roland PA-120 (preamp and EQ)

Tape recorder:
Fostex X-28H

Website: https://www.dehlimusikk.no/
Store: https://store.dehlimusikk.no/"

Serviced Sequential Circuits Pro One with Fatar Keybed, Original Box & Manual

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via this eBay listing, also on Reverb

"The Sequential Circuits Pro-One is a legendary monophonic analog synth prized for its fat bass, searing leads, and incredibly flexible modulation capabilities. Compact yet powerful, it delivers the iconic Prophet-series sound in a hands-on design that’s become a must-have for serious synth players and collectors.

This Pro One is in excellent condition. It includes the original shipping box (and if being shipped, this is the box it will ship to you in) and manual (which has some writing in it). This Pro One was serviced by Synthchaser in September 2025. Work done included:

Recapped all original tantalum capacitors
Replaced original unreliable membrane style keybed with Fatar keybed
Cleaned pots & switches
Tuned & calibrated"

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Weston PRO-2021 Analog Synthesizer - DIY SCI Pro-One

Note: links to listings are affiliate links for which the site may be compensated.
video upload by JSI

See the Weston label below for additional posts.

via this Reverb listing

Pics of the inside below.

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One synth, one song! Situation cover by Munatix

video upload by Munatix

"One synth, one song!
Alison and Vince called it a ‘Situation’. What’s your take on it?
We used just the legendary Sequential Circuits Pro-One for this one. Check out our full instrumental version on your favorite streaming platform!"

Yazoo's Synth Sounds with the Pro-One 🎹

video upload by RetroSound

"(c)2007-25 by RetroSound
supported by UVI: http://bit.ly/retrosound-uvi

❤️ Support #RetroSound​ channel: https://retrosound.creator-spring.com

One of my favorite tracks from the early 80s.
Only You by Yazoo from the album Upstairs at Eric’s (1982)
Written by Vince Clarke

Featured the Sequential Circuits Pro-One Synthesizer (1981)

This cover song series contains my own recreations of my favourite songs from the last 50 years. The original music from which I take inspiration belong to their respective owners. I recreate tracks only for personal passion and to pay homage to these tracks."

Sequential Circuits Pro-One in Custom Wood Case & Clear LED Mod & Pitch Wheels SN 2594

Note: links to listings are affiliate links for which the site may be compensated.

via this eBay listing

"This one comes in a Custom Wood (Pacific Northwest Walnut made by Synthwood) and includes custom light-up modulation wheel and pitch-bend wheel. It looks really beautiful with the wood and would match perfectly with a Prophet 5 next to it. Tested and fully functional, this Pro One is a J-wire version serial #2594. There are some minor signs of wear to the synth (mostly limited to a small number of scratches on the bottom and rear), but overall it's in great shape and the top face looks very clean. It's been serviced as needed by current owner's synth tech. This is a classic Sequential mono keyboard synth great for bass, leads and effects, with a fun built-in step sequencer and arpeggiator."

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Sequential Circuits Pro-One Synthesizer Turbo MIDI Restored SN 0582

Note: links to listings are affiliate links for which the site may be compensated.

via this eBay listing

Additional Tone Tweakers Listings

"This is no ordinary Pro-1. This one's been meticulously refurbished by a highly skilled professional over way too many hours and is working perfectly and better than the rest.

It's also got the new turbo CPU by Music Technologies Group and MIDI + CV. This upgrade cost around $230 plus installation. This is the one to buy. Sold by professional perfectionists and packed properly to arrive safely."

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Cosmische Echoes: 1970s Inspired Apple Loops

video upload by Ross Totino and Fans of Collision

"Cosmische Echoes: 1970s-Inspired Apple Loops
Hypnotic, Pulsing, and Drenched in Vintage Vibe

Step into the sonic universe of 1970s German 'Kosmische Musik' and 'Krautrock' with this exclusive collection of 138 Apple Loops ready to add instant retro-futuristic warmth to your tracks! Recorded in the late ‘90s using authentic vintage gear, these loops deliver the hypnotic, analog textures that defined an era of experimental electronic music.

Created with Legendary Gear:
🔹 **70s Conn Min-o-Matic – Classic mechanical beatbox rhythms
🔹 **Sequential Circuits Pro One – Deep, pulsing synth lines
🔹 **Lexicon Alex – Lush, spacey atmospheres
🔹 **Sony DAT Machine – Pristine late-90s digital capture

What’s Inside?
Seven curated folders packed with motorik grooves, lush arpeggios, and cosmic textures, ready to drop into your DAW for seamless creativity. Whether you're producing ambient, electronic, or experimental music, these loops provide an instant gateway to the vintage 70s Kosmische sound**.

🔗 **Get it now on Gumroad and bring some Krautrock magic to your productions!

https://rtotino.gumroad.com/l/rdqio"

Another Vintage Analog Synth Jam

video upload by Reuben Jones

"A simple jam I made a while ago and uploaded to Instagram (@reuben0jones). Now on YouTube.

The Tempest, apart from doing drums, is clocking both the PolyEvolver making the digital sounding effects, and a Tanzbar which is simply clocking a sequence on the ARP Sequencer and sending CV/Gate to the Pro~One which is sending CV back to the ARP Sequencer so I can change key on the Pro~One's keyboard. At least I think that's how I did it. Korg MS10, Logan Vocalist and Octave Kitten 2 are played on top.

ARP Sequencer Model 1611
Dave Smith Poly Evolver
Dave Smith Tempest
Korg MS10
Logan Vocalist
Octave Kitten 2
Sequential Circuits Pro~One"

Sunset Strip Sequential Circuits Pro-One SN 8090 w/ Original Box

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via this listing

On the box:

GUITAR CENTER
7402 SUNSET BLVD.
HOLLYWOOD, CA. 90046

I bought my first synth there, the Oberheim Matrix-6, back in 1986.

From the listing:

"Original box! Super clean! Found in storage in Hollywood, mostly computer items. The man was a computer & software developer. Looks like never played. Wood side were never put on it appears. I played this keyboard through an amplifier. Makes lots of weird sounds. I’m not a keyboardist but had fun. Will pack safely."

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Sequential Circuits Pro One Analog Synthesizer SN 6473 w/ Custom Wood Case & Prophet-5 Knobs

Note: links to listings are affiliate links for which the site may be compensated.

via this listing

Additional Perfect Circuit listings

"PRO ONE ANALOG SYNTHESIZER FEATURES

Includes power cable
J-Wire version, serial number #100-6473
MIDI and CPU mod installed
"Rolls Royce" wooden case mod
Tuned & calibrated"

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Cantique de Noël / O Holy Night (Keyboards and Therevox version)

video upload by Benjamin Dehli

"A synthesizer / keyboard version of the Christmas carol Cantique de Noël / O Holy Night by Adolphe Adam. For the vocal melody I used a Therevox ET-4.3.

This version is inspired by the recordings and live performances of Bing Crosby, Luciano Pavarotti, Andrea Bocelli, but perhaps most of all Céline Dion (especially the vocal melody).

Instruments:
Dehli Musikk 4-track Glockenspiel: Glockenspiel
Dehli Musikk 4-track Music Box: Music Box
Doepfer Dark Energy: Drums and Percussion
Hammond C3: Organ
Hohner Clavinet D6: Clavinet / Baritone Guitar
Korg MS-20: Drums
Korg Polysix: Synth Harp
Logan String Melody II: Synth Strings
Louis Zwicki Pianette: Piano
Mellotron M4000D: Violins, Cello, Flute and Choir
Moog Matriarch: Synth Pad
Roland SH-09: Synth Bass and Drums
Sequential Circuits Pro-One: Synth Brass and Drums
Therevox ET-4.3: Vocals
Yamaha DX7: Tubular Bells
Yamaha L-20D: Harmonium

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♫ Jamming With a Bunch of Synths ♫ ----- (138)

video upload by Bata

Wait for 1:24

5U Modular (Synthesizers.com, STG Soundlabs, Synthetic Sound Labs)
Akai MPC X
Behringer 2600 (ARP 2600 clone)
Behringer Kobol Expander (RSF Kobol Expander clone)
Behringer Model D (Minimoog 2016 reissue clone)
Behringer Pro-1 (Sequential Circuits Pro One clone)
Behringer RD-6 (Roland TR-606 clone)
Behringer TD-3-MO (Devilfish modded Roland TB-303 clone)
Casio CSM-1
Clavia Nord Wave
cre8audio East Beast
cre8audio West Pest
Erica Synths Syntrx II
Elta PF-3 Stereo Multimode Filter (Formanta Polivoks chips)
Eurorack Modular (2HP, Behringer, Expert Sleepers, Intellijel)
Korg Delta
Korg Mono/Poly (x2)
Korg SQ-1 (analog style sequencer)
Ladyada Xoxbox (Roland TB-303 clone)
Landscape Noon
Make Noise 0-CTRL (analog sequencer/touch keyboard)
Moog Source
Roland CM-300 Sound Canvas
Roland P-330 Piano Module
Simmons SDS-V
Studio Electronics Boomstar 5089 mk1
Yamaha CS-15

SEQUENTIAL CIRCUITS PRO ONE DEMO

video upload by Synth Tailor Electronics

"Here's an excellent Sequential Circuits Pro One synth that packs a punch!
This Pro One has been fully restored and has the upgraded Fatar Keybed and Prophet 5 style knobs! Power Supply rebuilt, potentiometers re-greased and switches cleaned."

Custom Sequential Circuits Pro One

Note: links to listings are affiliate links for which the site may be compensated.

via this Vemia listing

Click the auction link on top when you get there for additional listings.

"Sequential Pro One with beautiful custom Prophet style wood case and P5 knobs."

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Blade Runner: Rachel's Song (cover)

video upload by Benjamin Dehli

"A cover version of Rachael's Song / Rachel's Song by Vangelis from the movie Blade Runner.
For the lead vocal part I used a Therevox ET-4.3.

Instruments:
Korg MS-20: Filter and noise for vocal
Korg Polysix: Synth pad
Logan String Melody II: Strings
Mellotron M4000D: Choir and chimes
Moog Minitaur: Bass
Rhodes Mark I Stage Piano: Electric piano
Roland D-50: Chimes
Roland SH-09: Quarter note beeps and noise
Sequential Circuits Pro-One: Brass and lead synth
Suzuki Omnichord OM-84 System Two: Harp
Therevox ET-4.3: Vocal
Yamaha DX7: Chimes

Amplifiers:
Fender Twin Reverb: Rhodes
Tandberg Model 2 T: Therevox

Microphones:
Shure SM57
Royer R-121

Effects:
Hairball Audio FET/RACK Revision D
Roland PA-120 (preamp, EQ and spring reverb)
Roland Dimension D SDD-320
Fulltone Tube Tape Echo
Chase Bliss Audio & Meris CXM 1978
DIYRE G Bus VCA Compressor

Tape recorder:
Fostex X-28H

Music: Rachel's Song from the Blade Runner soundtrack by Vangelis"