Sequential Fourm 4-voice analog synthesizer with Polyphonic Aftertouch

4-voice analog synthesizer with Polyphonic Aftertouch 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. Fourm's 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 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

Sequential Fourm 4-voice analog synthesizer with Polyphonic Aftertouch

4-voice analog synthesizer with Polyphonic Aftertouch

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.

Fourm's 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
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.