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The Sequential Fourm is a powerful 4-voice analogue synthesiser tailored for musicians and sound designers who prioritize authentic, warm, and punchy vintage tones in a compact, portable form factor. Drawing inspiration from the legendary Prophet-5 architecture, it offers deep, knob-per-function sound design that eliminates menu diving; however, users should note that its 37-note slim-key format may feel cramped for those accustomed to full-sized piano weighted keys.
| Model Part Number | SEQ-3900-UK |
|---|---|
| Brand | Sequential |
No, the Fourm relies on its pure, raw analogue signal path, which is designed to be paired with external effects pedals or DAW plugins.
Yes, the Fourm allows you to save and recall your custom sound designs directly on the device.
Yes, the 37-note slim-key keyboard features both velocity sensitivity and polyphonic aftertouch for maximum expressivity.
Please check the latest firmware manual for specific poly-chaining capabilities as they are subject to system updates.
Always use the original power supply provided by Sequential to ensure stable voltage and prevent damage to the analogue circuitry.
The Fourm features a highly capable, hands-on arpeggiator that can be synced to external MIDI clock.
Verify that your output cables are connected to the main left/right output jacks and that the filter cutoff is not fully closed.
Check that the MIDI channel on your controller matches the MIDI channel set in the Fourm settings and ensure the MIDI cables are correctly plugged into the MIDI IN port.
Check your external software settings or global menu to ensure aftertouch velocity curves are set correctly for your playing style.
Connect the Fourm to your studio setup via standard 5-pin MIDI DIN or USB MIDI for host synchronization. To ensure longevity, always use the included power adapter. The wooden side panels and metal chassis should be wiped down with a soft, dry cloth; avoid using liquid cleaners or harsh chemicals. To prevent keybed wear, avoid leaving the unit in high-humidity environments and cover the keys when not in use to prevent dust accumulation between the slim keys.
