Sequential Fourm 4-Voice Analog Synthesizer w/Poly Aftertouch & Prophet-5 Voice Architecture

Sequential Fourm 4-Voice Analog Synthesizer w/Poly Aftertouch & Prophet-5 Voice Architecture

Shop Sequential Fourm: A New Form of Expression

Meet Fourm, the compact analog synthesizer built to transform the way you play. Designed by Sequential, Fourm combines legendary tone with modern expression, putting a world of sound at your fingertips.

The Sound of a Legacy
At its heart, Fourm delivers four powerful voices of genuine Sequential analog sound. Built on the legendary Prophet-5 voice architecture-right down to its characteristic envelope curves-it captures the warmth and punch that defined a generation. Dual oscillators with simultaneous wave selection pair with a classic 4-pole low-pass filter and bass compensation to deliver a sound that is both timeless and fresh.

Play with Feeling
Housed in a solid steel chassis, Fourm features the custom-engineered Tactive(TM) keybed. This 37-slim-key keyboard is tuned specifically to complement Fourm's analog engine, but its headline feature is the return of polyphonic aftertouch. For the first time in 40 years, Sequential brings this incredibly expressive feature to your fingertips, allowing you to shape each note individually-adding vibrato, swell, or timbre shifts with the slightest change in pressure.

Shape Your Sound Instantly
Fourm's modulation section is inspired by the legendary Sequential Circuits Pro-One, the monosynth that fueled countless bass lines. This hands-on modulation matrix invites you to tweak, twist, and transform your sound in real time, turning simple patches into complex, evolving textures.

Inspiration on Autopilot
When you need a spark, Fourm's powerful arpeggiator delivers. From cascading, syncopated patterns with dotted rhythms to simple, driving sequences, the arpeggiator responds to your playing with inspiring musical results. With re-latching, repeat settings, and six interactive modes, it's a performance powerhouse.

Fourm isn't just a tool; it's your creative partner. Built for the next generation of synthesists.

Features:

• Two Prophet-5 lineage analog oscillators per voice
• All oscillators have simultaneously selectable waveforms, including the LFO
• Oscillator B supports low frequency modes for use as polyphonic LFO modulation
• Classic Prophet-style Sync
• Variable square wave pulse width per oscillator (PWM)
• 4-Pole resonant lowpass filter drawn from the Prophet-5, revs 1 & 2
• Filter enhanced with bass compensation for thick sounds even with high resonance
• Filter can be driven into self-oscillation with the resonance control
• Filter Keyboard tracking: quarter, half, full
• Feedback with an aggressive drive circuit for extra edge
• White, pink, and violet Noise types allow for greater sonic variation
• Four-stage (ADSR) filter envelope generator for tone shaping and assignable modulation
• Four-stage (ADSR) Amp envelope generator for volume shaping
• Velocity modulation of envelope amounts for dynamic performance
• One global LFO for creating movement in the sound
• Seven LFO wave shapes: sine, sawtooth, reverse sawtooth, square, S/H (sample and hold), Noise, and DC
• LFO can synchronize to tempo at different step values
• Four LFO wave shapes can be selected simultaneously for complex modulations