Description
Analog Oscillators & Filter
Fourm delivers two Prophet-5 lineage oscillators per voice with simultaneous waveform selection and classic sync, passing through a 4-pole resonant low-pass filter with bass compensation for thick, punchy analog tones.
Polyphonic Aftertouch
The 37-note Tactive™ slim-key keyboard offers polyphonic aftertouch, allowing expressive per-note modulation including oscillator pitch, filter cutoff, amplitude, and LFO parameters for nuanced performances.
Hands-On Modulation
Inspired by the Pro-One, the top-panel modulation matrix provides immediate access to sources and destinations, enabling complex modulation paths with color-coded visual feedback and flexible routing in seconds.
Sequencer & Arpeggiator
Fourm includes a polyphonic step sequencer with 64 steps and acid-style glide per step, alongside a versatile arpeggiator with six modes, re-latching, and tempo sync, supporting creative composition and performance workflows.
Two Prophet-5 lineage analog oscillators per voice with simultaneous waveform selection and classic sync
4-pole resonant low-pass filter with bass compensation and self-oscillation capability
Tactive™ 37-note slim-key keyboard with polyphonic aftertouch for expressive performance
Pro-One style top-panel modulation matrix with flexible source/destination routing
Polyphonic step sequencer with 64 steps and per-step glide plus arpeggiator with six modes
Unison (monophonic) mode and polyphonic glide (portamento) for versatile playability
Vintage mode adds voice-to-voice variations for authentic analog character
100% analog signal path with feedback, noise types, and dual ADSR envelopes for tone shaping
Intuitive knob-per-function layout with spring-loaded pitch wheel
Robust, all-steel chassis for stage and studio use
Synth Type: Keyboard Synth
Sound Generation: Analog
Keyboard: 37 Slim Keys with Synth Action
Touch Sensitivity: Yes
Aftertouch: Polyphonic Aftertouch (Destination Assignable)
Expression Controls:
1x Pitch Bend
1x Modulation
Display: Monochrome LCD
Number of Sounds, Kits, or Samples: 128x Factory Sound Preset
Maximum Polyphony: 4 Voice
Multitimbrality: 1-Part
Performance Functions: Arpeggiator, Octave Shift, Sequencer
Oscillators: 2x Variable (Sawtooth, Sine, Square)
Mixer: Oscillator, Oscillator 2, White Noise (Level)
Amplifiers: 1x VCA
Envelopes: 2x Filter/VCA/Assignable Envelope Generator: Delay, Attack, Decay, Sustain, Release
Filters:
Number of Filters: 1
Characteristic: Analog CEM 3320 Chip
Type: Low-Pass
Slope: 4-Pole/24 dB (LPF)
Controls: Cutoff, Resonance, Envelope Amount
LFOs:
Number of LFOs: 1x Global
Waveforms: Sawtooth Up, Sawtooth Down, Square, Triangle, Random, Sample & Hold
Controls/Modes: Clock Sync
Destinations: Oscillator 1 Frequency, Oscillator 2 Frequency, Oscillator 1 and 2 Pulse Width, Low-Pass Filter Cutoff, VCA, VCF, VCO, Filter Cutoff, Amp
Modulation Matrix: 11-Slot per Patch (3 Sources / 8 Destinations)
Aftertouch Destinations: Amplifier Envelope Amount, Filter Cutoff Frequency, LFO Amount, Low-Pass Filter Cutoff, Oscillator 1 Frequency, Oscillator 2 Frequency, VCA
Glide/Portamento: Yes
Arpeggiator: Yes
Audio I/O:
1x 1/4″ TRS Main Output
1x 1/4″ TRS Unbalanced Stereo Headphone Output
Pedal Support: 1x 1/4″ Expression/Footswitch
MIDI I/O:
1x DIN 5-Pin Input
1x DIN 5-Pin Output
1x DIN 5-Pin Thru
USB I/O: 1x USB-C (Host Connection, MIDI)
Power Requirements: AC/DC Power Adapter (Included)
AC Input Power: 100 to 240 VAC, 50 / 60 Hz
AC/DC Power Adapter: 12 VDC at 1.2 A, Center-Positive (Included)
Power Consumption: 14 W
Color: Black
Dimensions: 22.1 x 9.9 x 2.8″ / 56.1 x 25.1 x 7.1 cm
Weight: 8.8 lb / 4 kg
