Introducing the Sequential Fourm

video upload by Sequential

Update: the first user videos added below. Note: this post is pinned on top, see below for new posts going up throughout the day.]

"Fourm 4-voice analog synth with polyphonic aftertouch

Fourm is a compact analog synthesizer that invites you to play, shape, and perform with unprecedented expression. With its legendary Sequential tone, hands-on modulation, and uniquely responsive Tactive™ keybed, Fourm is a creative partner helping to bring your musical ideas to life.

Synth sounds and drums exclusively by Fourm. Composed by Peter Dyer."

https://sequential.com

See the dealers on the right of the site for availabily.

User videos:



Playlist:

1. The new Sequential Fourm in 60 seconds! #analogsynth #synth - Available at Signal Sounds
2. Sequential FOURM -- J3PO demo & overview
3. Sequential Fourm Analog Synth INHALT Demo & Discussion
4. Sequential FOURM Review — Classic synth sounds in a small package! - BoBeats
5. Introducing the Sequential Fourm Synth | First Look & Demo - Gear4music Synths & Tech
6. Sequential Fourm: Poly aftertouch, stacked waves, expressive arps – First look and sound demo - MusicRadar Tech
7. Sequential Fourm Performances & Overview - Sweetwater Soundcheck
8. SEQUENTIAL FOURM: the synth we’ve ALL been waiting for? - Projet Home Studio

Press release and pics follow:


Sequential Introduces Fourm: A Four-Voice Analog Synth with Polyphonic Aftertouch

A New Fourm of Expression

San Francisco, CA — September 23, 2025 — Sequential has announced the release of its most affordable, synthesizer to date. Fourm is a compact, 100% analog instrument that redefines expressive electronic performance. With its warm, organic tone, hands-on modulation routing, and a uniquely responsive polyphonic aftertouch keyboard, Fourm is ready to bring your musical ideas to life.

At its core, Fourm delivers four analog voices of genuine Sequential sound, derived from the legendary Prophet-5 — complete with dual oscillators, a classic 4-pole lowpass filter, and envelope curves modeled after the 1978 original. The result is unmistakable Sequential warmth and punch, now with overdriven feedback for a performance-ready edge.

For the first time in 40 years, Sequential has returned to polyphonic aftertouch. The team developed the new Tactive™ slim-keys poly AT keybed to work in concert with Fourm’s analog synthesis engine. Every element was co-designed and precisely calibrated to unlock new levels of expression, enabling a deeper connection to our signature sound that no off-the-shelf keybed could deliver. The result is a more expressive bond between player and instrument, energizing new modes of creativity.

“Wowww holy smokes: this thing sounds and feels amazing,” said Bryn Bliska, (keyboards for Chappell Roan, Maggie Rogers, Jacob Collier). “The polyphonic aftertouch is seriously so fun… Sequential nailed it.”

“We’re so excited to bring this innovative all-analog keyboard into the world,” said David Gibbons, Sequential CEO. “At a price-point that most people expect to pay for a monophonic synth, we think this product will invite legions of musicians who have longed for the magic of polyphonic analog sounds to start their journey of discovery with Sequential.”

Notably inspired by the Pro~One, Fourm’s top-panel modulation matrix puts deep sound design at your fingertips—no menu diving required. Modulation sources and destinations are clearly labeled, connections are made with a button press, and color-coded indicators make even complex routings easy to manage.

With its compact footprint, professional-grade build, and a sound engine rooted in Sequential’s most iconic instruments, Fourm is a powerful new voice in analog synthesis.

About Sequential
Sequential has been at the forefront of synthesizer innovation since 1974, creating instruments that inspire musicians and shape the sound of modern music. With a legacy built on the iconic Prophet synthesizers, Sequential continues to push the boundaries of sound design with cutting-edge technology and exceptional craftsmanship.

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Bleep Labs Thingamagoop 2 w/ Clear Front Panel

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

via this eBay listing

"The now discontinued and rare Bleep Labs Thingamagoop 2 light controlled synthesizer. Has a built in speaker, a 1/4in audio output, and a 1/8in CV output so it's compatible with Eurorack. Has both analog and digital synth modes. The Bleep Labs Thingamagoop 2 is an experimental synthesizer designed for creating unique and atmospheric sounds. This hybrid desktop synthesizer offers a CV input and audio output, making it versatile for various audio setups. With its clear design and compact size, it is perfect for creating ambient noise and musical compositions on the go. Additionally, the Thingamagoop 2 features speakers for real-time sound playback and can be powered by batteries for added portability."

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WMD's William Mathewson Chats Skorpion – Exclusive Interview

video upload by Metamyther

"In this in-depth interview, we sit down with William Mathewson of WMD to discuss the Skorpion Eurorack module—likely the most extreme wavefolder ever made and a groundbreaking sound design tool for modular synthesizer enthusiasts. William shares the story of WMD’s evolution, the challenges of designing complex Eurorack modules, and how the Skorpion took 5 years to get completed. This conversation gives you insights into one of the year's most anticipated modules."

Inside the Studio with Ian Hultquist | GForce Oberheim TVS Pro

video upload by GForce Software

"Ian Hultquist is a renowned composer, producer, and sound designer for film, documentaries, and television. Formerly a member of the successful band Passion Pit, Ian has crafted powerful scores for projects like Mommy Dead and Dearest, The First Monday in May, My Blind Brother, Memoria, and Dead City.

We visited Ian at his studio in London, UK, where he gave us an inside look at how he uses the GForce Oberheim TVS Pro virtual synthesizer.

Developed in collaboration with Oberheim, this synth recreation captures the depth, warmth, and characterof the original Two Voice Pro — along with the spirit of innovation that made it a legend.

Full Story: www.gforcesoftware.com/blog/ian-hultquist-tvspro
GForce Oberheim TVS Pro: www.gforcesoftware.com/products/tvs-pro/

Credits:
Ian Hultquist: www.ianhultquist.com/
Video: www.loftworks.co.uk/
Artist Relations and additional sound design: www.createnewstories.com"

Serviced ARP Pro Soloist Vintage Analog Synthesizer Keyboard

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

via this eBay listing

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How to Recreate the Iconic Underworld Born Slippy Intro on Novation Summit and Montage/MODX

video upload by Scott's Synth Stuff

"Underworld's intro to their huge hit Born Slippy is one of the best known intros, with an iconic stab and pad sound. Dance floors the world over go crazy when they hear that identifiable sound and chord sequence. In this video I show you first how to sound design these sounds, using my Novation Summit, and then again on the Montage. However, you can use my explanation to recreate the sound on most any synthesizer. I then show you how to play the chords."

Remaking Underworld's Dark and Long below.

0:00 Intro
0:45 Born Slippy
1:38 Deconstructing the Sound
3:49 Bitimbral Sound Construction
4:57 Creating the Stab Sound on Summit
6:38 Adding Filters
6:55 Envelopes
8:49 Effects
9:59 How to Play the Chords
11:11 Creating the Pad Sound on Summit
12:09 Envelope
12:29 LFO Modulating Filter
13:30 Effects
13:59 Putting It Together
15:19 On the Montage
15:50 Stab Sound in AN-X
17:24 Stab Sound in AWM2 (For MODX)
19:36 Pad Sound
20:36 Reverb

How to Remake Underworld's "Dark and Long (Dark Train)" on the Roland Fantom/Fantom-0

video upload by Scott's Synth Stuff

"In this video, I take one of the earliest songs "Dark and Long (Dark Train)" by my favorite band, Underworld, and remake it in my Fantom-6. If you have a Fantom or a Fantom-0, you can do this yourself! I show how I picked the sounds, then go through the various parts and create sequences in the pattern sequencer. Once I'm done, I put it all together and show how it can be performed! You could do this on any multitimbral synth with a sequencer (MODX or Montage), using a DAW like Abelton, or even using a looper!"

0:00 Intro
1:49 Picking the Sounds
2:36 Recording the Drums
5:45 The Bass Line
6:43 Adding Delay to the Bass Line
8:14 Recording the Synth Stabs
10:35 Recording the Vocal Ahhh
11:34 Recording the Pad Sound
12:14 Playing Back the End Result!
15:46 Summary

Moog Liberation SN 3267

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

via this Reverb listing

"The Moog Liberation (because it is a “keytar”) is probably the most criminally underrated synthesizer in the history of the Moog brand. Forget about keytars for a sec...

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Sat Night Synthesizer Fun with Oberheim Teo-5

video upload by James Dyson

"Sound Design fun and play
Sounds from METAMORPHEUS Soundset for Oberheim TEO-5
128 deeply programmed Presets included covering all musical taste and styles.
No added FX or Processing.
Available for £15, if you wish to purchase please send to my Paypal address firestormer2010@yahoo.co.uk and I will send ASAP to you're Email address."

Update:

Better Audio ..Sat Night Synthesizer Fun with Oberheim Teo-5
video upload by James Dyson

Rare Gear Demo: The Johnson Intonation Trainer (1966)

Note: Auction links are affiliate links for which the site may be compensated.
video upload by Instrument Attic

via this eBay listing

"The 1966 Johnson Intonation Trainer is a rare and intriguing instrument developed by the E.F. Johnson Company of Waseca, Minnesota. Originally designed to assess pitch-matching and pitch-discrimination abilities, this device has garnered attention for its unique features and potential applications in modern music production.  

One of the standout characteristics of the Johnson Intonation Trainer is its full polyphony, allowing all 37 keys to be played simultaneously. Each key is associated with its own oscillator, enabling microtonal adjustments and the exploration of unconventional scales and tunings. The instrument offers four distinct voicing options, ranging from basic sine waves to more complex, reedy tones. Additionally, the “Scale Selector” switch provides a choice between standard tempered tuning and a tunable mode, with individual “Tunable Scale Controls” corresponding to each note on the keyboard for precise pitch calibration.    

Housed in a robust fiberglass case, the Intonation Trainer features a built-in speaker, though it can also be connected to external amplifiers or mixers via standard 1/4” outputs. Some units include a vibrato effect, though functionality may vary between models. 

In contemporary settings, the Johnson Intonation Trainer has found a niche among experimental musicians and sound designers. Its ability to produce rich drones and facilitate microtonal exploration makes it a valuable tool for creating unique sonic textures. The instrument’s vintage analog circuitry imparts a distinctive warmth and character that is highly sought after in modern music production.

Due to limited production and the passage of time, functional units of the Johnson Intonation Trainer are exceedingly rare. Finding one in full working condition, complete with original documentation, is a remarkable discovery for collectors and enthusiasts alike. The scarcity of this instrument, combined with its unique capabilities, underscores its status as a treasured piece of audio history."

via this eBay listing

"Made in 1966 in Waseca, Minnesota by the E. F. Johnson Company. Originally designed as an ear training and intonation device, but in practice it is a unique fully polyphonic analog synthesizer with extensive tuning control. Very few were made, and surviving examples in this condition are vanishingly rare.

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U-He Zebra 2: Dark Cinematic Presets. Sound Demo Performance

video upload by Anton Anru

"🌌 Noise of Oblivion is a collection of 50 atmospheric presets for the U-He Zebra 2 virtual synthesizer. It features 5 drones, 16 pads, 7 rhythmical, 12 strings, and 10 textures.
🏙 The soundset contains dark, cinematic soundscapes that evoke the atmosphere of a sci-fi thriller, dystopian world, or intense drama. This carefully crafted collection delivers a wide variety of timbres designed to take your productions into uncharted sonic territory, blending futuristic tones with a vintage edge.

📦 Get these presets: https://antonanru.sellfy.store/p/u-he...

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dreadbox Artemis Sound Demo (no talking)

video upload by Bonedo Synthesizers

"In this video, we explore the Dreadbox Artemis—a 6-voice polyphonic analog synthesizer that combines vintage warmth with modern flexibility. Featuring dual VCOs with waveshaping, a powerful filter section, and high-quality stereo effects by Sinevibes, Artemis is designed for expressive sound design. With MPE support, polyphonic aftertouch, and a built-in sequencer, it's a versatile tool for any synth enthusiast."

0:00 Pads
6:45 Leads
9:32 Arp & Bass
12:16 Dub Chords
14:06 Percussion & FX
14:54 Sound Design from Scratch I
17:17 Sound Design from Scratch II

Vacuum Tube Modular Synthesizer Prototype by Electroserf

video upload by epeasant

"This is a unique project with an all-tube audio path using obsolete Soviet rod tubes.

A detailed demonstration of Electroserf's latest vacuum tube design is shown, featuring a focus on each module and video of the synthesizer creating music.

Designed to maximise rich vacuum tube sound, there are no semiconductors whatsoever in the audio sections of these unique creations. All of the sounds in this video are composed using only this new Electroserf synthesizer prototype."

Electroserf all-tube audio path synthesizer modules - short demo

video upload by epeasant

Also see Electroserf Vacuum Tube Synthesizer Modules from 2021.

Adamsynths Warthog Modular Synth with Total Recall is Here

video uploads by Adamsynths

Playlist:

1. Adamsynths™ Warthog – Modular Music Miniatures

In this video, we present a series of short musical sketches, each created entirely with the Adamsynths™ Warthog modular synthesizer.

🎹 These compact compositions – each under a minute – showcase the expressive potential of Warthog patches in a musical context.

Adamsynths™ Warthog – where a patch is not just a moment, but a memory you can share.

Chapters
00:00 – Monkey – Rhythmic Pulse & Synced VCOs
00:29 – Bowland – Rhythmic Pulse & Synced VCOs
01:05 – Interstellar – The Magpie Lead
01:21 – Color TV - Keep calm and enjoy the Warthog

2. Adamsynths™ Warthog – Real Time Snapshot Switching & Morphing

In this video, we showcase two key features of the Total Recall system in the Adamsynths™ Warthog modular synthesizer: Snapshot and Snapshot Morph.

🎛️ Snapshots are switched with incredible speed in real time. Using the Mood Wheels, snapshots can be morphed into one another with refined transitions. This allows patches to continuously transform, generating new sonic textures through the movement of the control wheel.

⏱️ Chapters
00:00 – Spooky – Restless Modulation
00:31 – Lost in Matrix 1 – Groovy Break Bassline 1
01:08 – Lost in Matrix 2 – Groovy Break Bassline 2
01:46 – Jono's Organ - Celestial Drift
02:21 – Lost in Matrix 3 – Groovy Break Bassline 3

3. Adamsynths™ Warthog - Atmospheric Patches

🎧 In this video, we showcase a selection of patches from the Adamsynths™ Warthog modular synthesizer.

Expect:
🌌 Atmospheric textures
🐗 Analog basses
🔮 Modulated soundscapes

⏱️ Chapters
00:00 – Sacrifice Sequence – Audio Modulated VCF
00:47 – Horse – Pulse! Drive! Hypnosis!
01:26 – Low Pass Flight Object – Low-rate VCO, Morphing, Modulation
02:00 – Orbit – Talking Bass Moovement
02:32 – Rate & Cut - The Mating Call of Hogzilla alias Trufflorex

Press Release Follows:


Your Awaited Companion Has Arrived: Adamsynths™ Warthog, the first analog modular synthesizer with TOTAL RECALL Now Available for Pre-Order at Early-Bird Price

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FM Patch Ideas - exploring custom sounds on the Kodamo EssenceFM

video upload by j bowman ALL PROCEEDS TO MEDICAL AID FOR PALESTINE

"Discover powerful FM patch ideas on the Kodamo EssenceFM in this sound design deep-dive! Whether you're an FM synthesis enthusiast, a Kodamo EssenceFM owner, or just passionate about creative sound design on FM synths, this video will inspire your next sonic exploration. We dive into custom patches, showcase unique modulation techniques, and explore the full potential of this powerful FM synth.

The Kodamo EssenceFM is a modern FM synthesizer packed with incredible features—and in this video, we unlock its hidden capabilities with experimental FM patch ideas that will elevate your music production, film scoring, or live performance setups.

If you're looking for FM synthesis tutorials, sound design tips, or want to explore how to create viral-worthy sounds using an FM synth, you're in the right place. We’re pushing the limits of FM sound design to craft evolving textures, dynamic pads, glitchy leads, and much more." Timestamps:

00:00 Intro
02:20 Looping envelopes
04:15 Random timbral variations
10:08 Stacks for overtones
12:20 One shot envelopes and noisy feedback
15:35 Wave sequencing
18:40 Wavetable
23:15 DX7 patch import
24:18 Virtual analogue VCO / VCF effect

Donner L1 vs SH-101: How close can we make it?? Sound design and comparison

video upload by MR TUNA Music

"In this video, we are putting the new Donner L1 analog synthesizer head-to-head with the original legendary Roland SH-101 to see just how close we can get! From pulsewaves to bass patches, we’ll break down the oscillators, filters, envelopes, and modulation to find out whether the Donner L1 can really capture that classic SH-101 sound. (spoiler: it can)

🔊 Expect A/B sound demos, patch design walkthroughs, and my honest thoughts on where the L1 nails it— and where the SH-101 still reigns supreme.

✨ If you’re curious about:

-Donner L1 sound demo
-Roland SH-101 comparison
-Analog synth sound design
-Best affordable SH-101 alternative

…this video is for you!"

The Electric Music Box: Exploring a Vintage Buchla 200 Modular System

video upload by Sarah Belle Reid

"Join my Patreon community to support future video projects like this one, and to access behind-the-scenes content + community events: https://www.patreon.com/sarahbellereid

In the spring of 2025, I spent a week at the Stony Brook University Electronic Music Studio, working closely with their original Buchla 200 Series modular synthesizer. Built in the early 1970s by pioneering instrument designer Donald Buchla & associates, this rare instrument is one of the few surviving and fully intact systems of its kind.

Due to its rarity, very few musicians have had the opportunity to interact with an original 200 system firsthand. I hope this video will help bridge that gap by sharing the instrument’s sound, design philosophy, and aesthetic intentions with a wider audience.

The video begins with a brief historical overview of the Buchla 200 Series and its role in the rapidly evolving landscape of 1970s electronic music. From there, I dive into a detailed walkthrough of the system, exploring each module with sound demonstrations and examples. We conclude with some reflections on the Buchla 200’s design philosophy, offering insights into the types of musical interaction the instrument was built to encourage (and why it continues to resonate with musicians and designers today).

Join my FREE Introduction to Synthesis mini course here (no experience or special gear required): https://www.soundandsynthesis.com/fir...

Learn how to make your own unique music with modular synths and master the fundamentals of sound design inside my step-by-step course & coaching program, Learning Sound and Synthesis®—no experience needed!: https://www.soundandsynthesis.com

This video was created in collaboration with the Buchla Archives, an organization dedicated to the thorough and thoughtful documentation and preservation of Donald Buchla’s work."

Build a Polyphonic Synth in Puredata / Plugdata – Full Tutorial

video upload by Floyd Steinberg

"🎹 Want to build your own polyphonic synthesizer from scratch? In this hands-on tutorial, you'll learn how to create a powerful synth in Puredata / Plugdata, covering everything from MIDI input to oscillators, envelopes, filters, LFOs, and polyphony management.

✅ Perfect for beginners and intermediate sound designers ✅ No external plugins required – just Puredata / Plugdata ✅ Includes a full demo and downloadable patches

📚 Topics Covered:

Creating a mono synth and expanding to polyphony
Avoiding aliasing in digital synthesis
MIDI integration and note handling
Envelopes, filters, and delay effects
Using abstractions, cloning, and data packing
Final demo with reverb (Blackhole)

📌 Timestamps:
00:00 Demo (dry signal)
00:23 What’s in this video?
00:57 What makes a polyphonic synth?
01:52 Building a mono synth
02:29 Aliasing explained
03:17 Anti-aliasing strategies
04:11 MIDI input setup
04:41 Envelope creation
06:13 Handling sustained notes
07:45 Adding a resonant low-pass filter
08:18 Polyphony management
08:30 Isn’t this brilliant?
10:11 Abstractions & modular design
12:10 Note distribution
12:50 Object cloning
13:04 Data packing/unpacking
14:34 Delay line & bug fix
15:15 Final thoughts
15:33 Reverb-enhanced demo

HÄLP ZIS CHANNEL
https://www.patreon.com/floyd_steinberg
https://floydsteinberg.gumroad.com/
https://floydsteinberg.bandcamp.com/
"

Weston Precision Audio - Pro2021 & Fractal Audio VP4

video uploads by Tumeni Knobs

"I recently finished building the Weston Precision Audio Pro2021 from the Synthcube.com kit. It was an amazing experience to build an entire synth from a giant box of parts, and I had a ton of fun. This synth is a clone of the venerable Sequential Pro One from the early 80s and it sounds incredible. It may seem limited but it offers tons of sound design capabilities, and it's certainly a lot of fun to play. Like with most synths, once you add reverb and delay you can't really go wrong.

This is just an informal, not very well prepared noodle on it. The Pro2021 has midi and CV control options on the back panel, and here I'm using my modular rack to drive the clock which drives the arpeggiator rate. The audio outs are going into the modular's mixer, and effects are from the Strymon Starlab and Veno-Echo. This particular patch is highlighting the oscillator sync feature, which I love the sound of. The internal LFO is modulating the pitch of Osc 1 and Osc 2 is set to triangle wave. Sounds big and fat and crisp and clean all at the same time. Cheers!"

Fractal Audio VP4... with a Synthesizer. Is it any good?

video upload by Tumeni Knobs

"Oddly, when researching the VP4, I couldn't find any demos of it being used with a synth, so I bought it anyway to see if it would be a good match. And yes, most emphatically yes, it is! It was immediately apparent they would go well together - and having only played around with the VP4 for a couple of hours, I thought this video might help others decide if it could work for them.

Obviously, the VP4 does so much more than Drive, Chorus, Delay and Reverb, but those are bread-n-butter effects, so I stuck with those for this quick sound demo. I've since messed around with other effects in the VP4, and found all kinds of great sounds.

The synth is a Weston Precision Audio Pro2021 - a clone of the legendary Sequential Pro One. I built this from a DIY kit I bought from SynthCube.com. It's a simple mono-synth, with no built in effects, and it really does sound excellent - and even more so with a little effects (or a lot of effects). It's filter is super resonant and easily gets squelchy, but that enables some of the greatest sounds when you play with the cutoff knob. ;-)

The recording is direct mono out from the synth into the VP4, stereo out from the VP4 to the iRig Pro Duo that's connected to my old iPhone 12. I opened the audio file in Presonus StudioOne to see if it needed some EQ or compression or normalizing, but I decided to leave it completely raw. I made no changes to the audio whatsoever.

So, I am completely sold on the VP4. I have a load of other effects pedals, including the Eventide H90, and this thing is amazing. The quality of the effects and the build are absolutely top notch, and the user interface is so easy to use right out of the box. It's way way way easier to mess with than the H90...

Cheers!"

CubuSynth Introduces ARKARION Eurorack Analog Synthesizer Voice

video upload by CubuSynth Modular

"The ARKARION is a complete analog synthesizer voice, housed in a Eurorack module, with digitally controlled signal routing. It combines the tactile experience of analog patching with the generative potential of randomized patches, all controlled via a single button or external gate signal.

Inspired by a fictional "DNA synthesis" concept, the ARKARION interprets a virtual genetic code to define routing schemes for CV and audio. This allows complex, evolving sound design with minimal patching.

This synthesizer is designed for users seeking a unique blend of structure and chaos, combining traditional subtractive synthesis elements with a digitally modulated signal flow. Whether played from a MIDI source, sequencer, or by hand, the ARKARION delivers a wide range of timbres, from tightly controlled tones to wild and unpredictable textures.

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Korg ARP Odyssey Rev3 37-Slim Key Duophonic Analog Synthesizer

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

via this eBay listing

"The synthesizer and case are in Mint Condition, and barely used. Includes Power Supply, Case, Manual, Power Supply. Original box does have minor water damage due to stored in attic where rain leaked in.

The Korg ARP Odyssey Rev3 37-Slim Key Duophonic Analog Synthesizer is a professional-grade keyboard synthesizer designed for musicians and producers. With its slim keys and duophonic design, this synthesizer provides a unique and expressive sound experience. As an analog synthesizer, it offers warm and authentic tones that can be further manipulated and crafted to create custom sounds. The Korg brand is well-known for its quality and reliability in the world of musical instruments and gear, making this synthesizer a popular choice for those seeking a versatile and high-performance instrument for their music production needs."

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