Sequential Fourm Compact 37-Key Keyboard Analog Synthesizer

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