Sequential Fourm
Product information "Sequential Fourm"
Legendary analogue sound, reimagined
Fourm is based on the legendary Prophet-5 voice architecture and delivers four true analogue voices with the distinctive warmth and punch that defined a generation. Dual oscillators with simultaneous waveform selection and a classic 4-pole low-pass filter (now with bass compensation) ensure every note hits harder than the last.
A new Fourm of expression
Fourm's 37-note keyboard features polyphonic aftertouch, enabling expressive techniques such as guitar-like note bending, solo-voice swells and other nuanced articulations – completely transforming the playing experience of a modern Sequential polysynth.
Modulation at your fingertips
Inspired by the Pro~One, Fourm's modulation matrix on the top panel lets you perform comprehensive sound design. Route "Sources" and "Destinations" instantly, visualise connections with colour-coded LEDs and create complex mod paths in seconds – no menu madness, just pure creative flow.
SYNTHESIS
- All oscillators offer simultaneously selectable waveforms – the LFO included
- Oscillator B supports low-frequency modes
- Classic Prophet-style sync
- Four-pole, resonant low-pass filter
- Feedback with a powerful distortion circuit
- Two ADSR envelopes
- Sequencer supports glide per step
INPUTS/OUTPUTS
- Main output (mono, 6.35 mm jack)
- Headphone output (mono, 6.35 mm TRS jack)
- MIDI In, Out, Thru
- USB for bidirectional MIDI communication
- Input for footswitch/expression pedal
POWER
- Separate power switch
- Power supply: 12 V DC, 1.2 A, centre-positive (included)
- Operable from mains voltages 100–240 V at 50/60 Hz
- 14 watts maximum power consumption
There was a Keys OS v1.0.0.2 update to improve keybed performance. More info on the manufacturer's site: https://sequential.com/support/download/fourm-operating-system/
New: Factory Bank 2 update doubles the number of onboard preset sounds. More info on the manufacturer's site: https://sequential.com/support/download/fourm-sounds/
- Aftertouch: polyphoner Aftertouch
- Dimensions (WxHxD): 562 x 251 x 70 mm
- Keyboard: 37 Slim Keys und polyphonem Aftertouch
- Keys: 37
- Other in/outputs: Main Out (Mono, 6,35 mm), Kopfhörer (Mono, 6,35 mm TRS), MIDI IN/OOU/THRU, USB, PEDAL
- Pedal/Controller Connection: Expression Pedal
- Playing Aids: 1 Mod Wheel, 1 Pitch Wheel
- Power supply: Netzteil: 12 V Gleichstrom, 1,2 A, Pluspol innen (im Lieferumfang enthalten)
- Subcategory: Synthesizer
- Synthesis: analog
- USB / MIDI: USB für bidirektionale MIDI-Kommunikation
- Weight: 3,97 kg
- 100 % analoger Signalweg für einen warmen, organischen Klang
- Intuitives, übersichtliches Layout mit einem Regler für jede Funktion
- Modulationsmatrix im Stil des Pro~One auf der Oberseite
- Resonanzfähiger Filter in der Tradition der Prophet-Serie mit Basskompensation
- Arpeggiator with Sequencer mode
- 128 hochwertige Presets
- 4-stimmiger Analogsynthesizer mit polyphonem Aftertouch
- sound generation: analog
Behind the synthesizer workshop Sequential Circuits from San Francisco stands the small but distinguished company of the legendary synth pioneer and Grammy winner Dave Smith. Dave Smith is also regarded as the driving force behind the MIDI specification, worked on physical modelling synthesis in Yamaha's development department as President, and among other achievements produced the Korg Wavestation and other technologies that are now legendary. After developing software synthesizers for Intel in 1994, he realised that his heart lay much more with hardware synthesizers and shortly afterwards founded his own company Dave Smith Instruments. Classics followed, such as the Prophet-X, Prophet Rev2, Prophet-6, OB-6 and the Tempest drum machine in collaboration with Roger Linn, to name just a few cult instruments. Dave Smith renamed his company DSI to Sequential in 2018 to close that chapter of his legacy.
The success story of his current company actually began in 1974. That year he not only founded his company, but also developed his first musical instrument, the analogue 16-step sequencer. The wood-cased sequencer was called the Model-600 and was originally intended just for Dave's personal Minimoog. But his invention was so well received that he sold a number of units. Driven by those first sales, the digital sequencer Model-800 and the Programmer Model-700 for Minimoog and ARP-2600 followed, before in 1978 he achieved perhaps his greatest triumph. With the Prophet 5 he developed the first fully programmable analogue polyphonic synthesizer with built-in microprocessors.
Just two years later he doubled the polyphony with the Prophet 10 and caused a sensation on the fiercely contested synthesizer market. In 2020 we were delighted to hear that Dave intended to breathe new life into his two flagships, the Prophet-5 and Prophet-10, with revised features while keeping the same circuitry. We are hugely proud to inform you on our landing page "The Return of the Prophets" about the most important innovations.
History has never sounded better!
