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.

• 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

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 SCI 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.