Sequential Fourm 4-Voice Polyphonic Analog Synthesizer w/ 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.
Warranty: 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.
Technical Specifications
- 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
: