810 MK2


30 HP


30 mm


60 mA +12V
50 mA −12V



3-in-1 Subtractive Voice Module


The System80 810 MK2 is a 30 HP Eurorack module consisting of a high quality subtractive analog synthesizer voice: Voltage Controlled Oscillator (VCO), Voltage Controlled Filter (VCF), and Voltage Controlled Amplifier (VCA).  More than just a clone, the design of each sub-module is inspired by the golden age of Japanese analog.  Add some modulation and an envelope generator to create a complete patchable analog voice with a distinctly vintage character.


  • Discrete Voltage Controlled Oscillator with temperature compensated exponential converter
  • 1 V/octave tracking over 7-8 octaves
  • Sync input with weak and strong oscillator sync modes
  • 1 V/octave CV input + two attenuated exponential CV inputs for pitch/frequency modulation
  • Six position octave range switch
  • Selectable waveform output: Pulse, Ramp, Triangle, or Sine
  • Pulse Width Modulation CV input
  • Sub-oscillator


  • Cascaded OTA design inspired by classic Roland topologies with selectable 12 or 24 dB response
  • self-oscillating with 1 V/octave tracking (3-4 octaves, normalized to VCO KYBD CV input)
  • VCO output and sub-oscillator normalized to two log attenuated inputs
  • Two frequency CV inputs, one unipolar and one bipolar
  • Voltage controlled resonance


  • Traditional single OTA design
  • Three log attenuated audio inputs with IN 1 normalized to VCF output
  • Two CV inputs with selectable exponential or linear response

Updates to the MK2 version

  • Solid-state octave switching
  • Memory recall of waveform selection
  • Steel back cover


The 810 MK2 is available from our network of dealers.  Prices are in US dollars ($USD).

Download User Guide