Dave Smith InstrumentsMopho x4 Analog Synthesizer


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Dave Smith Mopho x4

Building on the Mopho lineage and containing the same sound engine as its predecessors, the Mopho x4 is a 4-voice polysynth with a completely analog signal path. Each of the Mopho x4’s four voices contain 2 analog oscillators, 2 sub-octave generators, a selectable 2- or 4-pole Curtis low-pass filter, four LFOs, 3 envelope generators (ADSR and Delay), a 16 x 4 step sequencer, and a re-latchable arpeggiator. The Mopho also boasts 20 modulation sources that can be routed to 43 different destinations. Talk about expansive, all-analog polyphony! 

Like all of Dave Smith’s devices, the Mopho x4’s front panel is arranged a logical, user-friendly layout that affords quick and easy control over the most essential parameters sans any menu diving, allowing users to program and edit on the fly. The unit also boasts a semi-weighted 44-note keyboard with velocity and aftertouch, and assignable pitch and modulation wheels.

For hardcore DSI enthusiasts, one exciting feature of the Mopho x4 is the unit’s Poly Chain port, which allows for an expansion of polyphony by allowing connectivity to the Mopho, Tetra, and Prophet ’08 synthesizers. This is a quick way to construct a huge sound using a relatively small amount of gear.

Mopho x4 Features

  • 100% analog signal path
  • Two oscillators per voice capable of producing sawtooth, triangle, saw/triangle, and variable pulse width square waves, with hard sync
  • Two sub-octave generators per voice (one octave below oscillator 1 and two octaves below oscillator 2)
  • One classic Curtis low-pass filter per voice (switchable 2- or 4-pole) with audio rate modulation, self-oscillating in 4-pole mode
  • Analog VCAs
  • Three envelope generators per voice (ADSR plus delay)
  • Feedback loop per voice with programmable level and gain
  • White noise generator
  • 4 LFOs per voice
  • Gated 16 x 4 step sequencer per voice (one sequence per program)
  • Arpeggiator
  • Glide (portamento): separate rates per oscillator
  • Full-sized, 44-note (F to C), semi-weighted keyboard action with velocity and aftertouch
  • Full-sized modulation wheel and spring-loaded pitch wheel
  • Fully programmable with four banks of 128 read-only factory programs and four banks of 128 user programs (1,024 total)

  • USB type B receptacle
  • MIDI In, Out/Thru, and Poly Chain
  • Left and Right audio outputs: 1/4" phone jack (unbalanced)
  • Sustain pedal input (accepts normally on or off momentary footswitch with 1/4" phone plug)
  • Expression pedal/control voltage (3.3 VDC max.) input (1/4" TRS phone jack)
  • Headphone output: 1/4" TRS stereo phone jack
  • Power supply for 100V – 240V AC operation
  • Operation manual
  • Free downloadable software editor for Mac OS and Windows
  • 9.4lb. (4.35kg)
  • (LxWxH): approximately 25.2" x 11.1" x 3.6" (64cm x 28.2cm x 9.1cm)
      Dave Smith Instruments Mopho x4 Analog Synthesizer Reviews