Table of Contents
1. Introduction
In September 2025, Sequential announced its most affordable analog synthesizer yet: the Fourm. With four analog voices and polyphonic aftertouch, this compact instrument blends classic Sequential sound with modern performance features. In this review, we’ll explore the history of Sequential Circuits and what makes the Fourm an exciting new release.
2. A Brief History of Sequential
The Early Years
Sequential Circuits was founded in 1974 by Dave Smith. Initially focused on sequencers, the company revolutionized electronic music with the Prophet-5 in 1978 — the first programmable polyphonic synthesizer with patch memory. Sequential also co-created MIDI, the universal communication standard for electronic instruments.
Other notable products from the early ’80s include the Pro-One and the vector-synthesis-based Prophet VS, both of which remain highly sought after today.
Decline, Revival, and Legacy
By 1987, financial challenges forced Sequential to close. Yamaha acquired the brand, but Dave Smith later re-emerged with Dave Smith Instruments (DSI) in 2002.
In 2015, Yamaha returned the Sequential name to Smith, and by 2018, DSI officially became Sequential. In 2021, Sequential joined the Focusrite Group, ensuring long-term stability. Although Dave Smith passed away in 2022, his legacy lives on in every Sequential design.
3. Sequential Fourm: The New Synth
Announcement and Vision
Unveiled on September 23, 2025, the Sequential Fourm is described as “the most accessible analog synth Sequential has ever made.” It combines classic analog circuitry with expressive modern features — most notably polyphonic aftertouch, something rarely found in this price range.
Full info https://sequential.com/modern-analog/fourm/
Key Features
| Feature | Description |
|---|---|
| Voices | 4 true analog voices |
| Keyboard | 37 slim keys with polyphonic aftertouch |
| Oscillators | 2 per voice, variable waveforms; Osc B doubles as LFO |
| Filter | 4-pole Prophet-style low-pass with bass compensation |
| Envelopes & LFO | 2 ADSR envelopes + flexible LFO |
| Mod Matrix | Front-panel routing inspired by the Pro-One |
| Sequencer | 64-step sequencer + arpeggiator with step glide |
| Connectivity | Mono out, headphone out, MIDI In/Out/Thru, USB-C |
| Build | Steel chassis, compact and durable |
| Price | $999 USD / ~€949 |
Strengths and Limitations
Strengths
- Authentic Sequential analog tone
- Expressive polyphonic aftertouch
- Compact, performance-focused design
- Intuitive workflow (knob-per-function)
- Affordable entry point into Sequential synths
Limitations
- Only 4 voices (limited polyphony)
- Mono output (no stereo outs)
- No built-in effects
- Slim keys may not appeal to every player
4. Why the Fourm Matters for Sequential
The Fourm represents a strategic move for Sequential:
- It’s the most affordable analog polysynth in their lineup, opening the brand to a wider audience.
- It bridges the past and present, drawing inspiration from the Prophet and Pro-One, while integrating USB-C and advanced modulation.
- It proves that analog synthesizers remain highly relevant in today’s music production landscape.
By making analog polyphony and expressive aftertouch more accessible, Sequential is empowering new generations of musicians.
5. Conclusion
The Sequential Fourm is more than just a synthesizer — it’s a statement. With four analog voices, hands-on workflow, and rare polyphonic aftertouch at under $1,000, it delivers the Sequential experience in an approachable format.
From the groundbreaking Prophet-5 in 1978 to the Fourm in 2025, Sequential continues to shape electronic music history. For producers, performers, and synth enthusiasts, the Fourm is a compelling new way to access the legendary Sequential sound.
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