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 Analog Synth INHALT Demo & Discussion
3. Sequential FOURM Review — Classic synth sounds in a small package! - BoBeats
4. Introducing the Sequential Fourm Synth | First Look & Demo - Gear4music Synths & Tech
5. Sequential Fourm: Poly aftertouch, stacked waves, expressive arps – First look and sound demo - MusicRadar Tech
6. Sequential Fourm Performances & Overview - Sweetwater Soundcheck
7. 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.

CLICK FOR MORE »

How to Start Tracks: Fourm + Microcosm into Digitakt 2

video upload by Sineway

"Fourm into Microcosm into Digitakt II – how I built a beat from nothing, faster than I expected.

In this video I build a beat from scratch using a brand-new setup: Sequential Fourm into Hologram Microcosm, captured and shaped on the Digitakt II.

Instead of treating effects as something you add at the end, I’m using the Microcosm as an idea generator - letting it transform a simple init patch into something that suggests harmony, rhythm, and direction very early on.

This is the first time I’ve made a track with this exact setup, and I was honestly surprised by how quickly it led to usable musical ideas.

The goal here isn’t to finish a track. It’s to show how I like to start - how I go from nothing to a beat that feels worth exploring further.

If you’ve ever felt stuck looping the same pattern without knowing where to take it next, this video sets up the foundation for what comes after. I’ll continue from this exact loop in the next video, where I focus on breaking out of the single-loop deadlock and opening things up into multiple patterns and directions."

Chapters:
00:00 Intro
00:35 My setup
00:56 Making a track from scratch
01:17 Quick overview of the Hologram Microcosm

CLICK FOR MORE »

🔥🎹 Sequential FOURM - SINTE ANALÓGICO polifónico (REVIEW + CLÍNIC en vivo) 🎹🔥

video upload by FutureMusic.es

Enable CC in the player for subtitles.

https://sequential.com/modern-analog/fourm/

Check with dealers on the right for availability.

"Sequential FOURM genera cuatro voces analógicas en un teclado con postpulsación polifónica; una nueva forma de tocar y moldear el legendario sonido Prophet en formato compacto y asequible…. Sesión interactiva con Zígor López, Jefe de Producto de la marca.

00:00:01 Music Intro (todos los sonidos Sequential FOURM, excepto baterías)
00:05:30 Workshop: Vista rápida de la máquina
00:12:00 Arquitectura del sintetizador
00:20:30 Demo rápida de varios sonidos
00:22:09 Creando un patch desde cero
00:30:40 Así hicimos la Intro con Sequential FOURM y Ableton
00:45:20 Preguntas y respuestas
01:30:00 Despedida"

Googlish:

"Sequential FOURM generates four analog voices on a keyboard with polyphonic aftertouch; a new way to play and shape the legendary Prophet sound in a compact and affordable format…. Interactive session with Zígor López, Product Manager for the brand.

00:00:01 Music Intro (all Sequential FOURM sounds, except drums)
00:05:30 Workshop: Quick overview of the machine
00:12:00 Synthesizer architecture
00:20:30 Quick demo of several sounds
00:22:09 Creating a patch from scratch
00:30:40 This is how we made the Intro with Sequential FOURM and Ableton
00:45:20 Q&A
01:30:00 Farewell"

¿El mejor Sequential moderno? Workshop del nuevo Sequential Fourm

video upload by Cutoff Pro Audio

"Descubre las posibilidades expresivas del nuevo sintetizador analógico Sequential Fourm, un instrumento compacto que combina la legendaria sonoridad de Sequential con unas posibilidades para actuar impresionantes.

De la mano de Chris Calcutt, Product Specialist de Novation, en este workshop exploramos cómo Fourm puede convertirse en tu aliado creativo para dar vida a tus ideas musicales, desde su motor de cuatro voces analógicas basado en la arquitectura Prophet-5 hasta su exclusivo Tactive keybed con polifonía de aftertouch, capaz de transmitir matices y articulaciones únicas por nota.

Este workshop sobre el nuevo Sequential Fourm ha tenido lugar en nuestra tienda de Barcelona."

Googlish:

"Discover the expressive possibilities of the new Sequential Fourm analog synthesizer, a compact instrument that combines Sequential's legendary sound with impressive performance possibilities.

With Chris Calcutt, Product Specialist at Novation, in this workshop we explore how Fourm can be your creative ally in bringing your musical ideas to life, from its four-voice analog engine based on the Prophet-5 architecture to its exclusive Tactive keybed with aftertouch polyphony, capable of conveying unique nuances and articulations per note.

This workshop on the new Sequential Fourm took place in our Barcelona store."

SEQUENTIAL FOURM: 4 voces analógicas para recrear un clásico

video upload by Hispasonic

Click CC for subtitles at the bottom of the player once the video starts.

Video descpription in Googlish:

Instead of a traditional review of the Sequential Fourm, we decided to take a different approach: putting it to work on a specific track. And not just any track: "Fade to Grey" by Visage—an absolute classic of 1980s British synth-pop. Every melodic and accompanying track you’re about to hear was created exclusively using the Fourm, starting from factory sounds (drawn from the approximately 300 initial presets) with only minimal tweaks. The only element not provided by the synth is the drums: an AI-generated Roland CR-78-style pattern, occasionally reinforced with a kick and snare from Logic’s sound library.

Along the way, Pablo demonstrates how to truly harness the power of a modern polyphonic analog synthesizer: polyphonic aftertouch (key for the lead vocal line, where some notes come alive while others fade out completely), intense mixer feedback (ranging from subtle thickening to nonlinear behavior with "ghost" harmonics), audio-rate filter modulation from Oscillator 2 (adding anything from brightness and vocal-like character to total sonic breakdown, depending on the intensity), glide for creating transition sweeps, and the LFO in random mode feeding the filter to ensure every note sounds unique.

We also cover specific recording techniques: layering basslines via MIDI using two different sounds and panning them; doubling hand-played pads so that the two takes aren't identical; and recording a MIDI pattern to free up both hands, allowing you to perform real-time timbral tweaks—adjusting the filter, resonance, and modulation intensity—during the actual audio recording.

📝 A quick refresher on the Fourm: a compact 4-voice analog synthesizer featuring two VCOs per voice, a 4-pole low-pass filter derived from the Prophet-5, one global LFO, two ADSR envelopes, a mixer with feedback capabilities, no internal effects, a mono output, a 37-key "slim" Tactive keyboard with polyphonic aftertouch, and a modulation matrix—inherited from the Pro-1—that is directly accessible right on the front panel. 00:00 Original vs. Fourm Version
00:24 Intro
01:35 Fourm Features
03:34 Polyphonic Aftertouch
04:57 "Fade to Grey" Intro
07:07 Bass
08:34 Chords
10:17 Sweep
12:32 Melody
18:50 "Clavi" Sound
19:34 Drums
20:39 Full "Fade to Grey" Version

Sequential Fourm - Quatrain Vol 1 & Vol 2 Full Demo (no talking) #custom #sounds #fourm

video upload by Scott McAuley Sounds

"Patches will be available at https://www.orano.co.uk/shop or http://www.synthsounds.co.uk

FX Used Valhalla Supermassive - (Two custom presets will be supplied with the bank)

Finally the release of Quatrain Volume 1 is here, it has been such an amazing synth to program, and the sound from the Fourm is unbelievable!

In this pack I supply 50 custom sounds along with two custom presets for Valhalla Supermassive (free VST) which were used in the full demo video.

A great selection of sounds here that will cover all genres!

I hope you Enjoy! and thanks for checking them out!

Cheers
Scott.

© Scott McAuley. All rights reserved.
#custom #sequential #fourm"

Sequential Fourm - Quatrain Vol 2 Full Demo (no talking) #custom #sounds #fourm

video upload by Scott McAuley Sounds

Comparing the Sequential Fourm to the Pro-One

"I Compared the Sequential Fourm to My Pro-One" video upload by Starsky Carr

0:00 intro jam and info
5:04 Really Deep Bass - THE FILTER
9:14 They've got Oscillators
11:24 Creating a Few Tones
15:11 PWM and how to match them
19:10 F to the M
20:00 Show Me The Sync
21:19 Pushing the Envelope 24:06 Overall..?

"Some genuine surprises in this head-to-head with the Sequential Fourm and the legendary Sequential Pro-One to find out if the Fourm can give the same vibe.

At first glance, the architecture looks familiar: dual oscillators, classic envelopes, a focused modulation section, and unmistakable Prophet-era DNA from Prophet-5 territory. But the big question is this: does the Fourm capture the raw punch, deep bass, and aggressive character that made the Pro-One a cult classic?

.. and I know it's not a clone :) but in this in-depth demo and comparison, I explore:

Oscillator behaviour, sync, PWM and FM
Filter differences (including low-end depth and resonance extremes)
Envelope response and modulation range
Bass performance, subs, and room-shaking tones
Where the Fourm goes beyond the Pro-One — and where it doesn’t

Rather than obsessing over perfect null tests, this video focuses on feel, playability, and whether the Four inspires the same kinds of sounds and musical ideas as the original Pro-One.

If you’re into analog monosynths, Sequential gear, vintage vs modern comparisons, or you’re wondering whether a contemporary synth can truly stand in for a rising-price classic, this one’s for you.

🎧 Headphones or proper speakers strongly recommended — some of these bass tones go very deep."

FOURM | MUSIC DEMO | SEQUENTIAL SYNTH (analog all-use sounds, no talking) 🚀🔥

video upload by FutureMusic.es

"Immerse yourself in the rich analog tone of the Sequential FOURM, showcased in this exclusive non-talking Music Demo featuring Zígor López, Sequential’s Product Manager. FOURM is a four-voice analog polyphonic synthesizer that brings the iconic Prophet sound into a compact, affordable form factor, radically redefining expressive playability for modern musicians and producers alike.

[ESP] Sequential FOURM, un sintetizador analógico polifónico de cuatro voces que combina el icónico sonido Prophet con la tecnología y diseño modernos en un formato compacto y accesible. En esta demo musical exclusiva, Zígor López, Jefe de Producto de Sequential, nos guía por las posibilidades expresivas que ofrece FOURM, ideal para músicos y productores que buscan combinar historia y vanguardia en una sola máquina."

The Sequential Fourm: He didn’t get it… until he played it.

video upload by Devin Belanger

"The Sequential Fourm looked limited on paper, but after a month in the studio, my perspective has completely shifted. In this Fourm review & demo, I’m moving past the specs to focus on 4 performance demo songs that showcase the unique tactile experience of this 4-voice analog synthesizer.

The combination of a 100% analog signal path and Polyphonic Aftertouch makes this one of the most expressive instruments Sequential has released in years. Whether you are scoring for film or sound designing from scratch, the Fourm demands a different approach to synthesis.

Get my Custom Synth Patches (Fourm coming soon): https://shop.milesawayofficial.com/co..."

SEQUENTIAL FOURM -new ANALOG 'affordable' polysynth!! (SOUNDS DEMO, no talking)

video upload by FutureMusic.es

"Discover the Sequential FOURM, a new compact polyphonic analog synthesizer that brings the legendary Prophet sound into an affordable and portable format. FOURM features authentic four-voice analog architecture with a 37-key keyboard supporting polyphonic aftertouch—unlocking expressive playing techniques rarely seen at this price point.

Timeline
00:01 Intro (demos by the Sequential 'audio demo team': Peter Dyer, Matia Simovich and James Terris)
00:32 Assorted analog lines, with 15 minutes of audio recorded directly from FOURM, with only occasional light limiting and no additional processing
15:52 'A New Fourm Of Expression' (official launch demo by Peter Dyer)
17:20 Outro"

Is this SYNTH the next INDUSTRIAL CLASSIC?

video upload by Tonepusher

"🔊Sounds, Presets & Templates🔊
Presets & Samples ► https://www.tonepusher.com/
FOURM presets► https://www.tonepusher.com/product-pa...

Is the Sequential FOURM the next Industrial classic?

Today we discover the ‪Sequential FOURM. The sound of Sequential synthtesizers helped shape EBM and industrial music sound, albums by bands such as Skinny Puppy, Ministry, Nine Inch Nails, KMFDM or VNV Nation. I'm putting the Sequential FOURM to the test to see if it can deliver that EBM and Industrial sound, just like the Prophet-5 and Pro-One did back then.

Chapters:
0:00 - intro
0:19 - Sequential in Industrial Music
1:03 - FOURM Overall Look
4:12 - Favorite Features
5:27 - Remaking Classics
7:59 - Full Track Demo + Final Notes"

Sequential Fourm NO TALKING Synth Demo

video upload by mylarmelodies

"Wanna just hear the Sequential Fourm? Here's a no talking demo I made for Sequential. Fourm is a 4 voice analogue polysynth with a sort of Pro One old skool aesthetic. It's a simple synth but I felt has class for days, weighty and bright, but can cut through. It's also tiny, but the controls are well spaced.

The video features Fourm alone, with UA Golden reverb, Boss DD-7 delay, and alongside the Roland T-8 and sequenced by Xynthesizr on iPad for some small vignettes/musical sketches.

Thanks to Sequential for agreeing to fund a demo, this is a cool machine."

OFFICIAL PAGE
⏵ https://sequential.com/modern-analog/...

CHAPTERS
00:00 - Filter Sweep
00:28 - Slow Fourm
00:52 - PluckyBass
01:05 - Bottle Service
01:30 - Two Osc Improv
02:15 - Two Osc Aftertouchy Improv
03:09 - Jazz Hands
04:18 - Seventh Heaven
05:04 - Quarter Tone Jam
05:50 - More Than That
07:35 - The Bassics
08:31 - Init Program Jam
10:50 - Dynamik Pad (uTuned)
12:04 - Kosmiche Acid
15:16 - Sync Sitar Outro Vibes

Enter to Win a Sequential Fourm!

via Sequential

Win a Sequential Fourm!

Analog polysynth with polyphonic aftertouch. Real analog. Real expression.

Fourm pairs classic Sequential tone with hands-on modulation and a polyphonic aftertouch keybed—giving you a deeply expressive instrument in a compact footprint.

Enter now for your chance to win - closes May 31.

👉 https://sequential.com/win-a-fourm-competition/

Sign up for the Oberheim mailing list and receive an extra entry!

Sequential Fourm - SYNTHWAVE PRESETS - 📼𝙉𝙞𝙜𝙝𝙩𝙙𝙧𝙞𝙫𝙚📼

video upload by Produkt Audio

"Get this entire soundbank HERE: https://produktaudio.com/copy-of-pro-...

Video showcases a portion of all the sounds you get in the pack. You can hear demo track produced with the patches on the site link for further sound examples.

Basic Reverb, Delay only applied to synth sounds for genre authentic presentation, no other processing.

----------------------------------------

The definitive Synthwave collection for the Sequential Circuits Fourm. This uncompromising pack of ultra-authentic, high-impact patches has been meticulously engineered to unlock the absolute peak of cinematic character and driving energy of the Fourm.

Each preset is directly inspired by the most iconic records in the genre, delivering an ultra-polished and expressive analog tone that instantly sounds as though it was pulled straight from your favorite tracks.

Built for deep playability, this soundbank makes full creative use of the synthesizer's expressive capabilities with full integration of velocity, the modulation matrix, and the flagship poly-aftertouch feature on every single patch in a way which has been carefully crafted to sound expressive, highly creative, and pristinely musical.

Featuring a comprehensive selection of sounds, all presets are neatly categorized and organized for immediate use, offering the definitive synthwave experience for the Fourm."

FOURM - Livestream Walkthrough

video upload by Sequential

"Join Product Specialist Chris Calcutt and Product Lead Carson Day for an in-depth look at Sequential’s FOURM—a new four-voice analog synth with polyphonic aftertouch.

In this livestream, we’ll dive into the synth’s architecture, explore sound design techniques, and share insights into the design decisions that shaped FOURM.

For more information on Fourm visit Sequential at:
https://sequential.com/modern-analog/..."

Sequential Forum Shorts by Tatsuhiko iino

video uploads by Tatsuhiko iino

Playlist:

1. SEQUENTIAL FOURM × LINE6 EchoPark #sequential #sequentialfourm #synthesizer #line6
2. SEQUENTIAL FOURM × VONGON ULTRASHEER #sequential #sequentialfourm #synthesizer #vongon
3. SEQUENTIAL FOURM × chase bliss MOOD Mk-2 #sequential #synthesizer #sequentialfourm #chasebliss
4. SEQUENTIAL FOURM × VONGON ULTRASHEER #sequential #synthesizer #sequentialfourm #vongon

Colin's Corner (In the Office) EP #20 - FutzVerb and the Fourm Synthesizer 🎹

video upload by McDSPTV

"In this episode of Colin's Corner, Colin checks out FutzVerb on the Fourm Synthesizer by Sequential 🔥

A very special thanks to Sequential for letting McDSP borrow the Fourm! 💚"

McDSP: https://www.mcdsp.com/
FutzVerb: https://mcdsp.com/plugin-index/futzverb/
Fourm Synthesizer: https://sequential.com/modern-analog/...
Sequential: https://sequential.com

Sequential Fourm | Ambient synth performance

video upload by Jay Hosking

"Please support my work on Patreon: / jayhosking
A live synthesizer jam performed entirely on hardware, with the Fourm at the centre.

The amazing Devin Belanger (‪@devinbelangermusic‬) aka Miles Away (‪@thisismilesaway‬) was kind enough to lend me his Sequential Fourm. Thank you, Devin! If you haven't checked out Devin's amazing channel or his music, please do so!

The Fourm is Sequential's entry-level analog polysynth, as far as I can tell. It has four voices, which is somewhat limited but OK for many circumstances, and sounds (to my ears) as good or better than any other Sequential synth I've personally owned. (Note: I haven't had a Prophet 5/10 and Devin swears by that thing.) So if the sound and a decent workflow are all that matters for you, and four voices is enough, then this thing is a no-brainer.

That said, its main feature is its poly-aftertouch keybed, which allows for you to modulate sounds by pressing into each of the keys. I love polyAT, and the Hydrasynth's polyAT keybed was tremendously inspiring to me. That said, I really struggled to get the polyAT to feel right for my playing. The biggest issue was a discrepancy between how the black keys responded versus the white keys. For the white keys, I could get a great linear aftertouch response, but with the black keys, it would often quickly ramp from 0 to 100 in a way I couldn't control. This could be something I get better at, or maybe it's this particular unit, or maybe it's just an issue with my skills. But ultimately, I found that the polyAT wasn't for me.

The sound, however, most certainly was. This thing sounds amazing. Here, I ran it through the Walrus M1 Mk2 (for auto-panning) and the Empress Reverb (for reverb), and then into the Soma Cosmos for looping. The first half was the more traditional "song" aspect, but truthfully, the second half wandering was my favourite. I could listen to a synth like this all day.

Thanks for listening.

Recorded live to a stereo output, with EQ, compression, and limiting on the master.

https://jayhosking.bandcamp.com"

The FOURM — Here's What It Can Do

video upload by Starsky Carr

"I've spent months building a full 128-patch sound bank for the *Sequential FOURM*, and this is your chance to hear it in action.

The bank includes 50 bass tones (covering everything from deep analogue subs to punchy, cutting leads), classic Prophet-5 patches, and a wide range of sounds designed to be genuinely usable in a mix straight out of the box.

The FOURM isn't trying to be a Prophet-5 or a Pro-One — and that's the point. It can go places those synths simply can't.

All patches are demonstrated dry and some with a simple reverb or chorus to demonstrate what it would sound like in a mix. So what you hear is the real character of the synth.

Download the pack and add your own reverb, delay, or chorus and they open up even further.

✅ Mix-ready sounds designed for real music production
✅ 50 bass tones + leads, pads, keys & classic analogue voices
✅ Prophet-5 inspired patches reimagined for the FOURM
✅ In sysex and SoundTower formats
✅ Full 128-patch bank — one complete sound library"

This Synth Has Soul – Sequential Fourm Ambient Performance

video upload by Sineway

"I didn’t expect a dry, mono analog synth to sound alive. But the Sequential Fourm has something different - I'd go as far as saying it has a soul.

This performance is completely free-form: no tempo, no MIDI. I built a flute-like patch that reacts to touch in unpredictable, musical ways and just recorded it in one take. It's using polyphonic aftertouch, but there's something else going on that seems to come from the filter feedback and envelope.

Reverb and delay were added in Ableton to bring it all to life. I then recorded a couple of other layers in the same way, all from the Fourm.

❤️ Support my work and download the flute patch used in this jam by joining the Patreon community: / sineway

► Synth: Sequential Fourm
► Reverb and Delay: Ableton's Hybrid Reverb and Air Delay Pro
► Recorded live, no quantization, no midi
► Genre: Ambient? (Let me know if I'm off here - it's my first in this genre!)"