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With its legendary tone, hands-on modulation, and uniquely responsive keybed, the Sequential Fourm is a compact, 4-voice analog synthesizer that's built on the legendary Prophet-5 voice architecture including the original envelope response curves and the classic Prophet 4-pole filter with enhanced bass compensation. The dual-oscillator sound engine offers simultaneous wave selection, unison, and the classic prophet-style sync.
Fourm’s 37-note slim-key keyboard features polyphonic aftertouch, unlocking expressive techniques like guitar-style note bends, solo voice swells, and other nuanced articulations. The top panel is inspired by the Pro-One with its deep modulation matrix easily accessible at your finger tips. Route sources and destinations with a button press, visualize connections with color-coded indicators, and build complex modulation paths in seconds. The Fourm includes a 12 VDC power supply.
- 37-note slim-key keyboard with polyphonic aftertouch
- Warm and organic, 100% analog signal path
- Intuitive, welcoming knob-per-function layout
- Pro-One style top-panel modulation matrix
- Prophet-lineage resonant filter with bass compensation
- Arpeggiator with sequencer mode
- 128 world-class presets
- Pro-quality, all-steel chassis
- All oscillators have simultaneously selectable waveforms (including the LFO)
- Oscillator B supports low-frequency modes
- Classic Prophet-style sync
- 4-pole resonant low-pass filter
- Feedback with aggressive drive circuit
- 2 ADSR envelopes
- Sequencer supports glide per step