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.
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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.
One-year warranty included
Wherever you are in the world, all Sequential hardware comes with a one-year warranty to cover any necessary repairs or replacements due to manufacturing faults.
Sequential Fourm Compact Analog Synthesizer Features:
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
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