Fourm Keyboard

Sequential Fourm

Fourm is a compact 4-voice analog synthesizer designed for expressive performance and hands-on sound design. Built around Sequential’s classic analog sound and a custom Tactive™ slim-keys keybed with polyphonic aftertouch, Fourm delivers a deeply integrated playing experience in a modern, portable format.

With a solid steel chassis, immediate modulation controls inspired by the Pro-One, and a newly updated OS with Factory Bank 2, Fourm is built to be played—not programmed through menus.

Key Features

• 4-Voice All-Analog Architecture: True analog signal path with the unmistakable Sequential character

• Polyphonic Aftertouch: Custom Tactive™ slim-keys keybed for detailed, per-note expression

• Hands-On Modulation Section: Pro-One-inspired modulation routing for fast, intuitive sound shaping

• Compact Steel Chassis: Road-ready construction with a minimal footprint

• Performance-Focused Design: Built for real-time control, expression, and playability

• Latest OS Update + Factory Bank 2: Expanded sounds and improved system performance

Sound & Playability

Fourm combines classic analog tone with modern expressivity. The polyphonic aftertouch keybed allows individual notes to respond independently to pressure, opening up dynamic control over filters, modulation, and timbre. The modulation section encourages experimentation, making it easy to create evolving textures, expressive leads, and punchy basses.

Fourm is designed for musicians who want expressive analog sound without compromise. It bridges the gap between classic Sequential instruments and modern performance needs, offering immediacy, depth, and a strong connection between player and sound.