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Sequential Fourm Compact 37-Key Keyboard Analog Synthesizer

Compact analog synthesizer with Tactive 37-note slim-key keyboard with polyphonic aftertouch, 100% analog signal path, intuitive knob-per-function layout, Pro-One style top-panel modulation matrix, prophet-lineage resonant filter with bass compensation, and arpeggiator with sequencer mode
MFR# SEQ-3900
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Sequential Fourm Compact 37-Key Keyboard Analog Synthesizer
Compact analog synthesizer with Tactive 37-note slim-key keyboard with polyphonic aftertouch, 100% analog signal path, intuitive knob-per-function layout, Pro-One style top-panel modulation matrix, prophet-lineage resonant filter with bass compensation, and arpeggiator with sequencer mode

In Stock

Product Description

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 Tactive keybed, Fourm is a creative partner helping to bring your musical ideas to life.

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

The Tactive 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 FOURM FEATURES:

  • Tactive 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
  • 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

More Information

Condition New
Width 22.1 in
Height 2.7 in
Depth 9.9 in
Unit Weight 8.8 lb
Input Connectors 1/4-inch TRS
Output Connectors 1/4-inch TRS
MIDI Connections In, Out, Thru, USB
Analog or Digital Analog
Number of Keys 37
Synthesizer Format Keyboard
Polyphony Yes
Aftertouch Yes
Arpeggiator Yes
Envelope 2 ADSR envelopes
Filters 4-pole low-pass filter
Oscillators Dual oscillators
Sequencer Sequencer mode

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