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Dave Smith Mopho x4

The Dave Smith Mopho x4 is a 4-voice polyphonic analog synthesizer with 44 semi-weighted, velocity sensitive keys with aftertouch. Each voice is powered by 2 oscillators that offer a selection between sawtooth, triangle, saw/triangle, and variable pulse width square wave waveforms. In addition to dual oscillators, each voice also has two sub-octave generators designed for creating sub-bass tones. You can alter and shape the voices through their Curtis low-pass filter, 4 LFOs, and 3 envelope generators.

Further sonic sculpting can be done through the voice-independent 16×4 gated step sequencer and arpeggiator. The Mopho x4 offers a variety of connectivity, including a 5-pin DIN MIDI input, output/thru, and poly chain connection that allows you to connect the Mopho x4 to a Mopho, Tetra, or Prophet ’08 synth for an increased voice count. While it features a variety of knobs for hands-on control, the free downloadable software editor for Mac and PC allows you to use your computer to edit sounds on the Mopho x4 via its USB port.

This synth has the right stuff and a 100% analog signal path

Mopho x4’s 100% analog signal path serves up massively powerful sounds with incredible sonic dynamism. When it comes to insanely great analog synth sounds, it’s what’s inside that counts. Dave Smith Instruments’ Mopho x4 is packed with cutting-edge analog technology and has the distinct advantage of being designed by an analog synth design legend. Mopho x4’s four voices each sport two analog oscillators, two sub-octave generators, a genuine 2/4-pole-selectable Curtis lowpass filter, three 5-stage envelope generators, four LFOs, a relatchable arpeggiator, and a 16 x 4 step sequencer. Along with all this ear candy, you also get healthy modulation options, with 20 sources and almost 50 destinations. Go ahead, grab a knob and frequency-modulate the filter to create bell-like metallic tones. Dial in some feedback to add tasty harmonic content. With Mopho x4, your creativity just flows.

Expand Mopho x4’s polyphony to fit your needs

You can easily expand Mopho x4’s polyphony to suit your musical needs. Dave Smith Instruments’ Mopho, Tetra, and Prophet ’08 can easily be connected to the x4’s Poly Chain port to juice its voice count. Poly Chain up to three Tetras with Mopho x4 to create a 16-voice analog monster synth. With the Mopho x4, the sky’s the limit!

Designed by an analog synth legend

Dave Smith was the design engineer and driving force behind Sequential Circuits, whose first product was the legendary Prophet 5 in 1977 – the first polyphonic synthesizer capable of storing the value of every parameter within its voicing and control systems. This was a watershed technological breakthrough, and the implications were staggering. Think about this: before the Prophet 5, it simply wasn’t possible to enter a patch number into a synth and recall sounds you had stored. The Prophet 5 and its successors were hugely successful, finding their way into every top studio and major act’s keyboard rig, and onto countless recordings by artists as diverse as Madonna and Weather Report! Impressive, yes – but Dave also invented a little thing called MIDI. OK, so the man’s a legend; one whose current company, Dave Smith Instruments, is responsible (albeit not singlehandedly) for keeping analog synthesis alive and well.

  • 100% analog signal path
  • Four voices, each with two analog oscillators and two sub-octave generators
  • 44 semi-weighted keys with aftertouch
  • Genuine 2/4-pole-selectable Curtis lowpass filters
  • Each voice sports three 5-stage envelope generators and four LFOs
  • Relatchable arpeggiator and 16 x 4 step sequencer per voice
  • USB 2.0 port enables bi-directional MIDI communication with a computer
  • Expandable via Poly Chain port
  • Designed and manufactured in San Francisco, USA


Sound Engine: Analog

Number of Keys: 44

Type of Keys: Semi-weighted, Aftertouch

Other Controllers: Pitchbend, Mod Wheel

Polyphony: 4 Notes

Number of Presets: 512 Factory, 512 User

Arpeggiator: Yes (Relatchable)

Sequencer: 16 x 4-step

Audio Outputs: 2 x 1/4″

USB: 1 x Type B (USB 2.0)

MIDI I/O: In/Out/Thru/Poly Chain

Pedal Inputs: Sustain, Expression/CV

Expansion: Via proprietary Poly Chain port

Power Supply: External, 13-15 VDC, 500 mA

Dimensions: 640 x 282 x 91 mm

Weight: 4.35 kg


For more information, please visit the manufacturer's website.