Detail 01
37-note slim-key keyboard with polyphonic aftertouch
Aftertouch can be applied per voice for note bends, swells, and more detailed chord articulation.
Product detailSKU #1500000465983
SequentialFourm Compact Polyphonic Analog Synthesizer
Salemodernelectronicpop
1/6
Independent shopping perspective
The Korena take
Sequential Fourm is a compact four-voice analog synthesizer with a 37-note slim-key keyboard and polyphonic aftertouch. Its Prophet-5-based voice structure pairs dual oscillators with a 4-pole resonant low-pass filter and bass compensation. Polyphonic aftertouch can shape individual notes and chord voices through bends or swells, while the top-panel, Pro-One-style modulation matrix keeps routing in view without menu navigation. With 128 factory presets, an arpeggiator, MIDI connections, USB MIDI, and an all-steel chassis, it is set up for direct playing and hands-on sound design.
Strong match
Who this is for
- Performing expressive parts with polyphonic aftertouch across the 37-note slim-key keyboard.
- Creating and routing modulation from the top panel without navigating menus.
- Using arpeggiator sequencer mode and per-step glide in studio or live synthesizer parts.
Consider the trade-offs
When to look elsewhere
- Players who need more than four simultaneous genuine analog voices.
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
Dual oscillators per voice
Waveforms can be selected simultaneously, and Oscillator B can operate at low frequency for modulation.
Detail 03
4-pole resonant low-pass filter with bass compensation
The filter shapes the analog voice while bass compensation supports low-end response.
Detail 04
Top-panel Pro-One-style modulation matrix
Buttons and color-coded indicators let you choose modulation sources and destinations without menus.
Detail 05
Built-in arpeggiator
Includes sequencer mode and glide control per step.
Final check
Know before you order
- 01The included 12V DC, 1.2A power supply is center-positive; the AC input accepts 100–240V, 50/60Hz.
- 02External MIDI can connect through 5-pin DIN In, Out, and Thru; USB provides bidirectional MIDI communication.
- 03A footswitch or expression pedal can connect through the pedal input.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01How many voices does Fourm have?
It has four genuine analog voices based on Prophet-5 architecture.
02Does it have built-in presets?
Yes. It includes 128 factory presets.
03Can I use headphones?
Yes. It has one mono 1/4-inch TRS headphone output.
04What audio output does it have?
It provides one mono 1/4-inch main audio output.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsSound
- Voices
- 4 genuine analog voices (based on Prophet-5 architecture)
1 detailsPickups & controls
- Power Switch
- Separate on/off switch
1 detailsPlayability
- Keyboard
- 37-note slim-key with polyphonic aftertouch
2 detailsBody & build
- Color
- Black
- Feedback
- Aggressive drive circuit
8 detailsConnections & power
- USB
- Bidirectional MIDI communication
- Pedal Input
- Footswitch/Expression pedal input
- Headphone Output
- 1 x 1/4 inch TRS (Mono)
- MIDI
- In, Out, Thru (5-pin DIN)
- AC Input
- 100–240V, 50/60Hz (universal)
- Power Consumption
- 14W maximum
- Audio Output
- 1 x 1/4 inch Mono (Main)
- Power Supply
- 12V DC, 1.2A (included), center-positive
2 detailsSize & weight
- Weight
- 8.76
- Dimensions
- 22.13 inch x 9.88 inch x 2.75 inch (56.2 cm x 25.1 cm x 7.0 cm)
10 detailsOther
- Modulation
- Pro-One style top-panel modulation matrix (no menus)
- Arpeggiator
- Built-in arpeggiator with sequencer mode, glide per step
- Security
- Anti-theft slot
- Oscillator Sync
- Classic Prophet-style sync
- Oscillators
- Dual oscillators per voice with simultaneous waveform selection (Oscillator B supports low-frequency modes)
- Chassis
- Pro-quality, all-steel chassis
- Filter
- Classic Prophet-lineage 4-pole resonant low-pass filter with bass compensation
- Presets
- 128 world-class factory presets
- Lfo
- Multi-waveform (simultaneously selectable)
- Envelopes
- 2 x ADSR envelopes (authentic Prophet-5 response curves)
