Sequential Fourm - Sintisajzer
4-Voice analog synth with polyphonic aftertouch
Fourm is a compact analog synthesizer that invites you to play, shape, and perform with unprecedented expression. With its legendary Sequential tone, hands-on modulation, and uniquely responsive Tactive™ keybed, Fourm is a creative partner helping to bring your musical ideas to life.
Synthesis
• Two Prophet-5 lineage analog oscillators per voice
• All oscillators have simultaneously selectable waveforms, including the LFO
• Oscillator B supports low frequency modes for use as polyphonic LFO modulation
• Classic Prophet-style Sync
• Variable square wave pulse width per oscillator (PWM)
• 4-Pole resonant lowpass filter drawn from the Prophet-5, revs 1 & 2
• Filter enhanced with bass compensation for thick sounds even with high resonance
• Filter can be driven into self-oscillation with the resonance control
• Filter Keyboard tracking: quarter, half, full
• Feedback with an aggressive drive circuit for extra edge
• White, pink, and violet Noise types allow for greater sonic variation
• Four-stage (ADSR) filter envelope generator for tone shaping and assignable modulation
• Four-stage (ADSR) Amp envelope generator for volume shaping
• Velocity modulation of envelope amounts for dynamic performance
• One global LFO for creating movement in the sound
• Seven LFO wave shapes: sine, sawtooth, reverse sawtooth, square, S/H (sample and hold), Noise, and DC
• LFO can synchronize to tempo at different step values
• Four LFO wave shapes can be selected simultaneously for complex modulations
Enhancements
• Up to six polyphonic aftertouch destinations selectable simultaneously
• Polyphonic aftertouch destinations: oscillator A frequency, oscillator B frequency, filter cutoff, amplitude, LFO frequency, LFO amount
• Pro-One style top-panel modulation matrix
• Two modulation buses with multiple sources and destinations and the ability to combine both buses at the destination
• Top panel modulation sources: filter env, oscillator B, LFO
• Top panel modulation destinations: oscillator A frequency, oscillator B frequency, pulse width A, pulse width B, filter cutoff, amplitude, LFO frequency, LFO amount
• Polyphonic glide (portamento)
• Unison (monophonic) mode with configurable voice count, from one to all four voices, plus chord memory
• Vintage setting recreates classic synth characteristics by adding voice-to voice variations in component behavior
• Arpeggiator with step sequencer mode
• Polyphonic step sequencer with up to 64 steps and rests
• Sequencer supports acid-style glide per step
• Sequencer can be used as a modulation source
Hardware
• Tactive™ 37-note slim-key keyboard with polyphonic aftertouch
• 100% analog signal path
• Intuitive, knob-per-function layout
• Spring-loaded pitch wheel with selectable range per program (1 to 12 semitones up and down)
• Pro-quality, all-steel chassis
• 22.13″ L x 9.88″ W x 2.75″ H (56.2 cm x 25.1 cm x 7.0 cm)
• Weight: 8.76 lbs. (3.97 kg)
Inputs and Outputs
• Main output mono (1/4” jack)
• Headphone output mono (1/4” TRS phone jack)
• MIDI in, out, and thru ports
• USB-C for bidirectional MIDI communication
• Footswitch/expression pedal input
• Pedal input also supports trigger and gate signals
• Separate power switch
• 12V DC 1.2A power supply, center-positive (included)
• Power supply can be plugged into an AC outlet capable of supplying from 100 V to 240 V at 50 Hz/60 Hz
• 14 Watts maximum power consumption
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