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
Sequential Fourm is a compact four-voice analog synthesizer designed for expressive hands-on sound creation. Its two voltage-controlled oscillators and classic Sequential analog filter architecture deliver warm, punchy subtractive synthesis with character inspired by the Pro One. The 37-key Tactive polyphonic aftertouch keybed adds an esp
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
