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Sequential Fourm Analog Synthesizer  From Sequential

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.

Sequential

$999.99

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Sales tax is only collected in the following states: CA, FL, NC, SC, TN and VA. If your state is not listed, sales tax will not be collected on your order.
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Manufacturer's Description from Sequential

Legendary Analog Sound, Reimagined

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.

A New Fourm of Expression 

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.

Modulation You Can Touch

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.

Sequential

About Manufacturer

Sequential is helmed by legendary instrument designer and Grammy-winner Dave Smith, the original founder of Sequential Circuits in the mid-70s. Dave designed the Prophet-5, the world’s first fully-programmable polyphonic synth—and the first musical instrument with an embedded microprocessor.

Dave is generally known as the driving force behind the generation of the MIDI specification in 1981. It was Dave, in fact, who coined the acronym. In 1987 he was named a Fellow of the Audio Engineering Society (AES) for his continuing work in the area of music synthesis. After Sequential, Dave was President of DSD, Inc, an R&D division of Yamaha, where he worked on physical modeling synthesis and software synthesizer concepts. He then started the Korg R&D group in California, producing the Wavestation products and other technology.

He took over as President at Seer Systems and developed the first soft synth for Intel in 1994, followed by the first fully professional soft synth, Reality, released in 1997.

Realizing the limitations of software, Dave returned to hardware and started Dave Smith Instruments, which released the Evolver hybrid analog/digital synthesizer in 2002. Since then the Sequential product lineup has grown to include the Prophet X, Prophet Rev2, Prophet-6, OB-6, Pro 2, and Prophet 12 synthesizers, as well as the Tempest drum machine, co-designed with friend and fellow electronic instrument designer Roger Linn.

 

Dave is generally known as the driving force behind the generation of the MIDI specification in 1981. It was Dave, in fact, who coined the acronym. In 1987 he was named a Fellow of the Audio Engineering Society (AES) for his continuing work in the area of music synthesis. After Sequential, Dave was President of DSD, Inc, an R&D division of Yamaha, where he worked on physical modeling synthesis and software synthesizer concepts. He then started the Korg R&D group in California, producing the Wavestation products and other technology.

He took over as President at Seer Systems and developed the first soft synth for Intel in 1994, followed by the first fully professional soft synth, Reality, released in 1997.

Realizing the limitations of software, Dave returned to hardware and started Dave Smith Instruments which released the Evolver hybrid analog/digital synthesizer in 2002. Since then the DSI product lineup has grown to include the Prophet 12, Prophet ’08, Pro 2, Mopho, and Tetra synths, as well as the Tempest drum machine, co-designed with friend and fellow electronic instrument designer Roger Linn.

Specifications

FEATURING

•37-note slim-key keyboard with polyphonic aftertouch

•Warm and organic, 100% analog signal path

•Intuitive, welcoming knob-per-function layout 

•Pro-One style top-panel modulation matrix

•Prophet-lineage resonant filter with bass compensation 

•Arpeggiator with sequencer mode

•128 world-class presets

•Pro-quality, all-steel chassis 

 

SYNTHESIS

•All oscillators have simultaneously selectable waveforms – LFO too

•Oscillator B supports low frequency modes

•Classic Prophet-style Sync

•4-Pole resonant lowpass filter 

•Feedback with aggressive drive circuit

•2 ADSR envelopes 

•Sequencer supports glide per step 

 

IN/OUT 

•Main output mono (1/4” jack) 

•Headphone output mono (1/4” TRS phone jack) 

•MIDI in, out, and thru ports 

•USB for bidirectional MIDI communication 

•Footswitch/expression pedal input 

 

POWER 

•Separate power switch

•12V DC 1.2A power supply, center-positive (included)

•Can be plugged into an AC outlet capable of supplying from 100 V to 240 V at 50 Hz/60 Hz.

•14 Watts maximum power consumption.

 

PHYSICAL SPECS 

•22.13" L x 9.88" W x 2.75" H (56.2 cm x 25.1 cm x 7.0 cm) 

•Weight: 8.76 lbs. (3.97 kg) 

•Anti-theft slot