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SEQUENTIAL FOURM 4-voice analog synthesizer with polyphonic aftertouch
Fourm is a compact analog synthesizer that offers an unprecedented level of expressiveness. Fourm combines Sequential’s legendary sound with highly practical modulation features and an exceptionally responsive keybed. This new creative companion will help you bring your ideas to life like no other.
Reinventing a legendary analog sound
Fourm’s four voices are based on the architecture of the legendary Prophet-5, right down to the envelope curves. You’ll enjoy the true Sequential analog sound. With its two oscillators allowing simultaneous waveform selection and its classic 4‑pole low-pass filter—now featuring a bass compensation function—Fourm brings a fresh dimension to the punchy, warm character that shaped the sound of a generation.
A new Fourm of expression
Fourm’s keyboard features 37 slim keys with polyphonic aftertouch, so you can perform expressive techniques like guitar-style bends, swells, and other nuanced articulations. It revolutionizes performance on a modern analog polyphonic synth.
Modulation at your fingertips
The modulation matrix, inspired by the Pro-One, is located on Fourm’s front panel so you can craft sounds easily without menu diving. Route sources to destinations with a single button press, visualize connections via color-coded indicators, and build complex modulation paths in seconds. This matrix is fast, intuitive, and designed to never interrupt your creativity.
- Display: OLED
- Aftertouch: Yes
- Arpeggiator: Yes
- Category: Synthesizer
- Color: Black
- Dimensions (mm): 562 x 251 x 70
- Inputs: Expression pedal, MIDI
- Envelope: ADSR
- Filters: Resonant low-pass filter, 4-pole, 24 dB per octave, inspired by the Prophet-5
- Key size: Medium
- Sound generator: VCO
- LFOs: 1
- User memories: 512
- Number of presets: 512
- Number of keys: 37
- Weight: 3.97 kg
- Max polyphony: 4
- Velocity-sensitive: Yes
- Sequencer: Yes
- Outputs: MIDI, Headphones, Jack, USB-C
- Key action: Dynamic with polyphonic aftertouch
- Transpose: Yes
- Synthesis type: Analog
- Additional specs:
• Front-panel modulation matrix inspired by the Pro-One
• Resonant filter in the Prophet lineage with bass compensation
• High-quality, all-steel chassis
• All oscillators and the LFO support simultaneous waveform selection
• Oscillator B also serves as an LFO
• Classic sync, as on the Prophet
• 4-pole resonant low-pass filter
• Feedback with an aggressive-sounding drive circuit
• 2 ADSR envelopes
• Per-step glide for the sequencer
Specific References
- KSE FOURM
- 0855346000487