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Key features:
- 4-voice analog engine based on Prophet-5 architecture
- Custom Tactive™ keybed with true polyphonic aftertouch
- Dual analog oscillators per voice with simultaneous waveforms
- Prophet-5 style 4-pole filter with bass compensation and self-oscillation
- Pro-One–inspired hands-on modulation, arpeggiator and poly step sequencer
- Brand new
- 1 Year Warranty
- Free delivery
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Sequential Fourm Synthesizer Keyboard, 37-Note, Slim-Key
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 keybed, Fourm is a creative partner helping to bring your musical ideas to life.
Fourm delivers four genuine voices of Sequential analog sound, built on the legendary Prophet-5 voice architecture—right down to its envelope response curves. With dual oscillators offering simultaneous wave selection and a classic 4-pole low-pass filter, now enhanced with bass compensation, Fourm captures the warmth and punch that shaped a generation—and takes it to the next level.
Fourm’s 37-note slim-key keyboard features polyphonic aftertouch, unlocking expressive techniques like guitar-style note bends, solo voice swells, and other nuanced articulations—completely transforming the experience of playing a modern analog polysynth.
Inspired by the Pro~One, Fourm’s top-panel modulation matrix puts deep sound design at your fingertips—no menu diving required. Route sources and destinations with a button press, visualize connections with color-coded indicators, and build complex modulation paths in seconds. It’s fast, intuitive, and designed to keep you in the creative flow.
Features
- Compact 4-voice analog synthesizer with polyphonic aftertouch
- Built on classic Prophet-5 voice architecture with authentic envelope response
- Two Prophet-5 lineage oscillators per voice with simultaneous waveforms
- Oscillator B includes low-frequency mode for polyphonic LFO modulation
- Classic Prophet-style sync and pulse-width modulation per oscillator
- 4-pole low-pass filter based on Prophet-5 rev 1/2 with bass compensation
- Filter self-oscillation capable; quarter/half/full keyboard tracking
- Feedback circuit with aggressive drive for added edge
- White, pink and violet noise sources
- 4-stage ADSR filter envelope with assignable modulation
- 4-stage ADSR amp envelope for volume shaping
- Velocity modulation of envelopes for dynamic performance
- Global LFO with seven wave shapes: sine, saw, reverse saw, square, S/H, Noise, DC
- LFO tempo sync with selectable step values
- Up to four LFO wave shapes selectable at once for complex movement
- Modern analog oscillator design with vintage tone and improved reliability
- Custom-engineered Tactive™ 37-key slim keybed with polyphonic aftertouch
- Deeply expressive per-note control for articulation and dynamics
- Solid steel chassis for durability
- Hands-on modulation section inspired by the Sequential Pro-One
- Powerful arpeggiator with six modes, re-latching, repeat, and up to three octaves
- Polyphonic step sequencer capable of chords, ties, rests, per-step glide, and modulation use
- Sequencer doubles as a modulation source for rhythmic patterns
- Designed for integrated, expressive performance and modern sound design
Specifications
| Synthesis |
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| Oscillator waveforms |
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| Oscillator B |
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| Sync |
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| Pulse Width |
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| Filter |
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| Filter enhancement |
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| Filter resonance |
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| Filter keyboard tracking |
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| Feedback |
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| Noise |
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| Filter envelope |
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| Amp envelope |
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| Velocity modulation |
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| LFO |
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| LFO waveforms |
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| LFO sync |
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| LFO multi-shape |
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| Aftertouch destinations |
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| Aftertouch routes |
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| Modulation matrix |
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| Mod sources (panel) |
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| Mod destinations (panel) |
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| Glide |
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| Unison |
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| Vintage behaviour |
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| Arpeggiator |
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| Step sequencer |
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| Sequencer modulation |
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| Keyboard |
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| Signal path |
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| Panel |
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| Pitch wheel |
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| Chassis |
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| Dimensions |
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| Weight |
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| Main Output (Output) |
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| Headphone (Output) |
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| MIDI (Input/Output) |
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| USB-C (Input/Output) |
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| Footswitch/Expression (Input) |
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| Power |
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Delivery
UK Deliveries
We offer FREE DELIVERY on orders OVER £99 to UK Mainland customers. Please see the table below for service details and costs.
| Service | DPD | FedEx | UPS |
|---|---|---|---|
| UK Standard (Orders Over £99) | 7-10 Working Days | Free of charge | ||
| Next Working Day Express | Next Day | £5.99 | Next Day | £6.99 | Next Day | £9.99 |
| Next Day Before 12:00pm | Next Day | £19.99 | Service Not Available | Service Not Available |
| Next Day Before 10:30am | Next Day | £22.99 | Service Not Available | Service Not Available |
| Saturday or Sunday | Weekend | £15.99 | Service Not Available | Service Not Available |
| Saturday or Sunday Before 12:00pm | Weekend | £19.99 | Service Not Available | Service Not Available |
| Saturday Before 10:30am | Weekend | £24.99 | Service Not Available | Service Not Available |
| Northern Ireland, Scottish Highlands & Islands | 2 Days | £15.99 | Service Not Available | Service Not Available |
| Channel Islands | 2 Days | £23.99 | Service Not Available | Service Not Available |
For more information on shipping surcharges and additional costs, view our full policy here.
European Deliveries
We ship to most European destinations using trusted courier partners DPD, UPS, and FedEx, with full tracking from dispatch to delivery.
At checkout, simply select your country and the available courier options and prices will be calculated automatically based on your order’s size, weight, and destination.
All prices are tax inclusive and you will NOT have to pay any Tax or Duty to the courier.
| Service | DPD | FedEx | UPS |
|---|---|---|---|
| Republic Of Ireland | 2-3 Days | £19.99 | Live Rates at Checkout | Live Rates at Checkout |
| Austria, Denmark, Estonia, Hungary, Latvia, Lithuania, Poland, Slovakia, Slovenia & Spain | 3-6 Days | £39.99 | Live Rates at Checkout | Live Rates at Checkout |
| Belgium, France, Germany, Italy, Netherlands & Luxembourg | 2-4 Days | £29.99 | Live Rates at Checkout | Live Rates at Checkout |
| Bulgaria, Greece & Romania | 5-8 Days | £54.99 | Live Rates at Checkout | Live Rates at Checkout |
| Croatia, Czech Republic, Finland, Portugal & Sweden | 4-6 Days | £44.99 | Live Rates at Checkout | Live Rates at Checkout |
| Norway | 6-8 Days | £69.99 | Live Rates at Checkout | Live Rates at Checkout |
| Switzerland | 3-5 Days | £49.99 | Live Rates at Checkout | Live Rates at Checkout |
For more information on shipping surcharges and additional costs, view our full policy here.
Rest of the World
We ship to most international destinations worldwide using trusted courier partners UPS and FedEx, providing reliable delivery with full tracking from dispatch to delivery.
At checkout, simply select your country and the available courier options and prices will be calculated automatically based on your order’s size, weight, and destination. (Coming Soon)
All prices are excluding VAT. Your country & local taxes will have to be paid to the courier before they deliver your goods. Please check with your governing body on what rates you can expect to pay.
| Service | DPD | FedEx | UPS |
|---|---|---|---|
| United States & Canada | Service Not Available | Email for a Quote | Email for a Quote |
| Australia, New Zealand, Fiji & Papua New Guinea | Service Not Available | Email for a Quote | Email for a Quote |
| Japan, South Korea, China, Hong Kong, Singapore, Taiwan, Thailand, Malaysia, Indonesia, Philippines, Vietnam, India & Sri Lanka | Service Not Available | Email for a Quote | Email for a Quote |
| United Arab Emirates, Saudi Arabia, Qatar, Kuwait, Bahrain, Oman & Israel | Service Not Available | Email for a Quote | Email for a Quote |
| South Africa, Egypt, Morocco, Kenya, Nigeria, Ghana & Tanzania | Service Not Available | Email for a Quote | Email for a Quote |
| Brazil, Argentina, Chile, Mexico, Colombia, Peru, Costa Rica, Dominican Republic, Jamaica & Trinidad & Tobago | Service Not Available | Email for a Quote | Email for a Quote |
For more information on shipping surcharges and additional costs, view our full policy here.
Returns
Our returns system is easy, you have the right to cancel an order up to 14 days, please check our full returns policy here.
Options shown below are for the product you are viewing and do not include any other items you may have in your basket. For a finance calculation on your entire basket, please click the finance link on the basket.
Select Novuna Personal Finance in the checkout to finance your order.
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If you have seen a better price but would rather buy from a trusted UK-based authorised dealer, then please complete the form below and we will do our best to match or beat any genuine price quote.
The following rules apply:
- The dealer must be a UK mainland authorised dealer of the brand in question
- The item/s must be brand new, in stock and available for next day delivery
- Items cannot be part of a sale
We only match UK based authorised dealers. For that reason we cannot match the following companies:
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- Bax-Shop (Netherlands)
- Kytary (Czech Republic)
Why buy from us?
- Outstanding Customer Service
- UK Phone Support
- Cheaper UK Returns Within UK
- Same High Level Warranty
- Secure Payment Service
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