37-key slim keybed with polyphonic aftertouch enables per-note expression for advanced performance techniques
Four genuine Prophet 5 analog voices with dual oscillators per voice and selectable waveforms deliver iconic vintage sound
Pro One-style top panel modulation matrix with color-coded indicators allows fast, intuitive sound design
Prophet lineage 4-pole resonant low-pass filter with bass compensation provides warm, punchy analog character
Step sequencer and arpeggiator with per-step glide and 128 factory presets support creative composition and performance
Summarized by Shop
Legendary Analog Sound, Reimagined
Fourm delivers four genuine voices of Sequential analog sound, built on the legendary Prophet-5 voice architecture-right down to its envelope response curves. With dual oscillators offering simultaneous wave selection and a classic 4-pole low-pass filter, now enhanced with bass compensation, Fourm captur
Voices
4 analog voices
Oscillators
2 per voice, selectable waveforms (Oscillator B supports low frequency mode)
Filter
4-pole resonant low-pass with bass compensation
Envelopes
2 ADSR per voice
Sequencer
Step sequencer with glide per step, up to 64 steps
Arpeggiator
6 modes, octave range, re-latching, repeat, step
Keyboard
37-note slim key with polyphonic aftertouch
Outputs
Main mono out (1/4" jack), headphone out (1/4" TRS), MIDI in/out/thru, USB MIDI, expression pedal input
