Description

Feel the Music:
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.

Fourm delivers four genuine voices of Sequential analog sound, built on the legendary Prophet-5 voice architecture—right down to its characteristic envelope response curves. With dual oscillators offering simultaneous wave selection and a classic 4-pole low-pass filter with bass compensation, Fourm captures the warmth and punch that shaped a generation—and takes it to the next level.

Fourm’s analog voice path is built around a modern oscillator chip inspired by the design used in the original Prophet-5 Rev 2. It delivers the same rich, musical tone as its vintage predecessor, now enhanced by the benefits of contemporary engineering — improved stability, reliability, and consistency. It’s the perfect foundation for Fourm’s 100% analog sound.

Fourm’s analog 4-pole lowpass filter chip is based on a classic design known for its rich, organic tone and musical resonance. The modern implementation faithfully preserves that sonic character while adding bass compensation. Now you can crank the resonance without sacrificing low-end power — keeping your sound full, bold, and unmistakably analog.

A New Fourm of Expression:
From its solid steel chassis to the custom-engineered Tactive slim-keys keybed with responsive polyphonic aftertouch, every element of Fourm was designed to deliver a fully integrated, high-performance playing experience. It’s a no-compromise, all-analog instrument, built for the next generation of synthesists.

Custom-designed by Sequential, the Tactive keybed features 37 slim-keys tuned specifically to complement Fourm’s analog synthesis engine. And for the first time in 40 years, Sequential has returned to polyphonic aftertouch, an incredibly expressive performance feature that brings per note articulations to your fingertips.

Polyphonic aftertouch is one of Fourm’s most expressive features, offering a direct and nuanced connection between your playing and per note synthesis parameters. It opens up new possibilities for articulation — from subtle dynamics to dramatic gestures — that go far beyond what’s possible with other high performance musical instruments and controllers.

Because polyphonic aftertouch is still relatively uncommon, there’s not much guidance out there on how to use it effectively. That’s why we’ve put together a list of techniques — and you don’t need to be a virtuoso player to benefit. This guide is for anyone curious about what polyphonic aftertouch can bring to their music.

Hands on Modulation:
Fourm’s modulation section is inspired by the legendary Sequential Circuits Pro-One, a highly sought-after classic monosynth that has propelled the bass lines of synthpop for decades. Explore the immediacy and flexibility of this hands-on modulation matrix and let your latest sonic inspirations take Fourm.

Fourm’s arpeggiator responds to your playing with inspiring musical results. Need a three octave setting with a dotted 8th note step value to create cascading, syncopated patterns? Fourm can do that and more. With re-latching, repeat settings, and six modes of interaction, the arpeggiator is a powerful tool for spontaneous composition and performance.

Tucked into the arpeggiator section, Fourm’s polyphonic step sequencer is a creative powerhouse. Yes, it can play back musical phrases — but it can also be used as a modulation source, perfect for triggering rhythmic filter patterns and more. With support for chords, ties, rests, Acid-style per-step glide, and deep modulation routing, the sequencer transforms Fourm into a dynamic, hands-on composition tool.

SKU: FOURM