Sequential FourM Analog Synthesizer Module

The Sequential FourM is a 4-voice analog synthesizer module that brings the iconic sound of the Prophet-5 and Oberheim SEM into a compact desktop format. With two voltage-controlled oscillators per voice, a sub-oscillator, and a resonant 2-pole filter, it delivers rich, warm analog tones. The extensive modulation matrix, dual LFOs, and polyphonic sequencer make it a powerful tool for sound design and live performance.

Advantages

Authentic analog circuitry with modern control features, including an OLED display and USB/MIDI connectivity. The individual voice outputs allow for external processing, while the CV/gate inputs integrate seamlessly with modular systems.

Suitable for

• Studio musicians and producers seeking classic analog synth sounds
• Live performers needing a portable, versatile synthesizer
• Electronic music enthusiasts and sound designers

Key specifications

• 4-voice polyphonic analog synthesizer
• 2 VCOs per voice with sawtooth, triangle, and pulse waveforms
• 2-pole resonant low-pass filter per voice (Oberheim SEM-inspired)
• 2 ADSR envelopes and 2 LFOs per voice
• 16-step polyphonic sequencer per voice
• MIDI In/Out/Thru and USB Type B (MIDI over USB)
• 4 individual voice outputs and stereo main output (1/4" TS)
• CV/Gate inputs for modular integration
• OLED display for parameter editing
• External DC power adapter included

Recommendations

The Sequential FourM is ideal for musicians who want the legendary Sequential sound in a compact, affordable module. Its deep modulation capabilities and polyphonic sequencer make it a creative powerhouse for any studio or stage.