Sequential Fourm – Compact 4-Voice Analog Synthesizer w/ Polyphonic Aftertouch

OVERVIEW

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.

KEY HIGHLIGHTS

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.

FEATURES & TECHNICAL SPECS

Design & Sound Architecture

Tactive 37-Note Slim-Key Keyboard with Polyphonic Aftertouch

100% Analog Signal Path for Warm, Organic Sound

Intuitive, Welcoming Knob-per-Function Layout for Instant Control

Pro-One Style Modulation Matrix on the Top Panel

Prophet-Lineage Resonant Filter with Bass Compensation

Arpeggiator with Sequencer Mode for Pattern Creation

128 World-Class Presets Crafted by Professional Sound Designers

Pro-Quality, Durable All-Steel Chassis for Stage and Studio Reliability

Synthesis Engine

Oscillators with Simultaneous Waveform Selection (including LFO)

Oscillator B with Low-Frequency Modes

Classic Prophet-Style Sync Functionality

4-Pole Resonant Lowpass Filter with Smooth Response

Feedback with Aggressive Drive Circuit for Extra Bite

2 ADSR Envelopes for Precise Shaping

Sequencer with Glide Per Step

Connectivity – Inputs/Outputs:

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 and Direct DAW Integration

Footswitch/Expression Pedal Input for Hands-Free Performance Control

Security:

Anti-Theft Slot

Power:

Dedicated On/Off Power Switch

12V DC 1.2A Power Supply, Center-Positive (included),

100–240V AC Compatible, at 50 Hz/60 Hz

14 Watts Maximum Power Consumption

Dimensions & Weight:

Length — 56.2 cm (22.13″)

Width — 25.1 cm (9.88″)

Height — 7 cm (2.75″)

Weight — 3.97 kg (8.76 lbs.)