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Sequential Prophet X 8-Voice Synthesiser

Dave Smith Sequential Prophet X front

The Dave Smith Prophet Sequential Prophet X is a bi-timbral 8-voice-stereo (with 16-voice mono) synthesiser combining samples and synthesis in one synth. The Prophet X is powered by a new engine with two simultaneous 16-bit, 48kHz sample-based instruments plus two high-resolution digital oscillators with wave shape modulation processed through analogue filters.

The Dave Smith Sequential Prophet X is the new bi-timbral super synth from the Dave Smith stable combining 8 stereo voices and 16 voices when used in mono.

So what's new in the Prophet X?

The Sequential Prophet X is the first Dave Smith synthesiser to combine samples and synthesis through real analogue filters.

The Prophet X comes with 150gb of 16bit / 48kHz built in samples created by sound designers 8Dio, ranging from acoustic and electronic instruments to ambient and cinematic effects making this synth a perfect editable sound source for producers, musicians, composers and sound designers.

The samples can be shaped through loop manipulation, time stretching and the synthesisers on board sound sculting functions including 4 envelope generators, 4 LFOs, a deep modulation matrix and much more including a dual effects engine with multiple reverbs, 2 delays, chorus, flanger, phase shifter, rotating speaker, a high pass filter and distortion.

* Pre-order yours now, shipping late May 2018!

Prophet X Other Features

  • Vintage designed 24 dB per octave Low Pass Filters
  • A 64 Step Polyphonic Step Sequencer with 6 notes per step and can be synced to external MIDI clock
  • 2 High resolution digital oscillators with both classic waveshapes and supersaw for more timberal possibilities with shape mod control
  • 61-Note, semi-weighted keyboard with velocity and channel aftertouch

Video review of the Sequential Prophet X

Prophet X Specifications


  • 2 multi-sampled stereo instruments per voice with editable sample start, sample end, loop size, and loop center, loop on/off, sample reverse, sample stretch, bit-rate reduction, and sample rate reduction
  • 150 GB of factory-installed 16-bit, 48 kHz sampled instruments created by 8Dio. An additional 50 GB of samples can be added by purchasing additional sound libraries. User-sample import is planned for December, 2018.


  • 2 digital oscillators per voice with selectable sine, sawtooth, pulse, and supersaw waves. You can vary the shape of any of the waveshapes.
  • Glide (portamento): separate rates per oscillator; (samples can glide in Sample Stretch mode)
  • Hard sync


  • 2 x analog 4-pole resonant low-pass filter per voice
  • Digital high-pass filter in Effects section


  • 4 loopable, five-stage (ADSR plus delay) envelope generators: Filter, VCA, and two assignable


  • Polyphonic step sequencer with up to 64 steps (6 notes per step), and ties and rests.


  • Four-stage (ADSR) envelope generator
  • Velocity modulation of envelope amount


  • 4 LFO’s with key sync, phase offset, and slewing per LFO
  • Five wave shapes: triangle, sawtooth, reverse sawtooth, square, and random (sample and hold)


  • 16-slot modulation matrix
  • 28 sources
  • 88 destinations
  • 11 additional dedicated sources: mod wheel, pressure, velocity, breath controller, footswitch, LFO 1, LFO 2, LFO 3, LFO 4, Env 3, Env 4


  • Fully-featured arpeggiator with up, down, up+down, random, assign modes
  • Selectable note value: 16th note, 8th note triplet, 8th note, dotted 8th note, quarter note
  • One, two, or three octave range
  • Re-latching arpeggiation
  • Note repeat


  • 2 digital effects on each layer
  • Stereo delay, BBD delay, chorus, flanger, phaser, vintage rotating speaker, distortion, high-pass filter, spring reverb, plate reverb


  • Master clock with tap tempo
  • BPM control and display
  • MIDI clock sync


  • Full-sized, semi-weighted, 5-octave keyboard with velocity and channel (mono) aftertouch
  • Backlit pitch and mod wheels
  • Spring-loaded pitch wheel with selectable range per program (1 to 12 semitones up and down)
  • Transpose controls for an 8-octave range
  • Hold switch latches held notes on
  • Polyphonic glide (portamento)
  • Unison (monophonic) mode with configurable voice count


  • 512 Factory Programs (4 banks of 128) and 512 fully editable User Programs with 2 layers (2 separate sounds) in each Program


  • MIDI In, Out, Thru
  • Sample import jack for USB Stick
  • Main stereo audio output: 2 x 1/4″ phone (TS, unbalanced)
  • Output B stereo audio output: 2 x 1/4″ phone (TS, unbalanced)
  • Pedal/CV: responds to expression pedals or control voltages ranging from 0 to 5 VDC (protected against higher or negative voltages.
  • Volume: responds to expression pedals or control voltages ranging from 0 to 5 VDC (protected against higher or negative voltages.
  • Sustain pedal input: accepts normally on or normally off momentary footswitch.
  • Sequencer: accepts normally on or normally off momentary footswitch to trigger sequencer playback.
  • Headphone output: 1/4″ stereo phone jack.


  • IEC AC power inlet for internal power supply
  • Operates worldwide on voltages between 100 and 240 volts at 50 to 60 Hz
  • Power consumption: 25 watts maximum


  • Dimensions: 38.44″ L x 13.53″ W x 4.13″ H (97.6 cm L x 34.3 cm W x 10.9 cm H)
  • Weight: 24 lbs

Live demonstration of Children by Troels Folmann on the Prophet X Synth

Live demonstration of Base X by Troels Folmann on the Prophet X Synth

Live demonstration of Automelodic by Troels Folmann on the Prophet X Synth

Dave Smith Prophet X Beat Architecture

Prophet X Romantic Stack