Model:
SEQ-3900
SKU:
SEQ-3900
Availability:
In Stock
$879.99
Estimated price. Final price and availability are subject to confirmation. Contact our sales team for a current quote.
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The Sequential Fourm Compact 4-Voice Analog Poly Synthesizer is a professional-grade instrument designed for musicians seeking high-quality analog sound.

The Sequential Fourm Compact 4-Voice Analog Poly Synthesizer is a professional-grade instrument designed for musicians seeking high-quality analog sound. It features 37 slim keys with synth action, touch sensitivity, and expression controls including pitch bend and modulation. The synthesizer offers 128 factory sound presets and supports up to four voices of polyphony. Additional functions include arpeggiator, octave shift, and sequencer.

It includes a 1/4" headphone output, a 1/4" expression/footswitch pedal, and MIDI I/O with DIN 5-pin inputs and outputs. The unit also features a USB-C host connection for MIDI compatibility.

  • Sound Generation: Analog
  • Keyboard: 37 Slim Keys with Synth Action
  • Touch Sensitivity: Yes
  • Expression Controls: 1x Pitch Bend 1x Modulation
  • Number of Sounds, Kits, or Samples: 128x Factory Sound Preset

Specifications

AC Input Power
100 to 240 VAC, 50 / 60 Hz
AC/DC Power Adapter
12 VDC at 1.2 A, Center-Positive (Included)
Audio I/O
1/4" / 1/4" Headphone
Bluetooth
No
Box Dimensions (LxWxH)
27.7 x 13.6 x 7"
Built-In Speaker
No
Color
Black
Dimensions
22.1 x 9.9 x 2.8" / 56.1 x 25.1 x 7.1 cm
Display
Monochrome LCD
Included Accessories
No
Keyboard
37 Slim Keys with Synth Action
Media/Memory Card Slot
No
Network I/O
No
Package Weight
13.47 lb
Power Consumption
14 W
Power Requirements
AC/DC Power Adapter (Included)
USB I/O
1x USB-C (Host Connection, MIDI)
Weight
8.8 lb / 4 kg
Aftertouch
Polyphonic Aftertouch (Destination Assignable)
Amplifiers
1x VCA
Arpeggiator
Yes
Built-In Effects
No
CV/Gate I/O
No
Envelopes
2x Filter/VCA/Assignable Envelope Generator: Delay, Attack, Decay, Sustain, Release
Expression Controls
1x Pitch Bend 1x Modulation
Filters
Number of Filters: 1 Characteristic: Analog CEM 3320 Chip Type: Low-Pass Slope: 4-Pole/24 dB (LPF) Controls: Cutoff, Resonance, Envelope Amount
Glide/Portamento
Yes
LFOs
Number of LFOs: 1x Global Waveforms: Sawtooth Up, Sawtooth Down, Square, Triangle, Random, Sample & Hold Controls/Modes: Clock Sync Destinations: Oscillator 1 Frequency, Oscillator 2 Frequency, Oscillator 1 and 2 Pulse Width, Low-Pass Filter Cutoff, VCA, VCF, VCO, Filter Cutoff, Amp
Maximum Polyphony
4 Voice
MIDI I/O
1x DIN 5-Pin Input 1x DIN 5-Pin Output 1x DIN 5-Pin Thru
Mixer
Oscillator, Oscillator 2, White Noise (Level)
Multitimbrality
1-Part
Number of Song Presets
No
Number of Sounds, Kits, or Samples
128x Factory Sound Preset
Oscillators
2x Variable (Sawtooth, Sine, Square)
Patch Points
No
Pedal Support
1x 1/4" Expression/Footswitch
Performance Functions
Arpeggiator, Octave Shift, Sequencer
Sequencer
No
Sound Generation
Analog
Sync I/O
No
Synth Type
Keyboard Synth
Touch Sensitivity
Yes
Transport Controls
No
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