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Quad Precision VCO
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A-111-4 contains four precision VCOs and has individual controls, inputs and outputs for each VCO available as well as a common control and output unit. After all the A-111-4 is very similar to four A-111-3 without LFO mode but built in output mixers for the three waveforms, and a master unit for all four VCOs.


Controls, inputs and outputs for each of the four VCOs:

  • 1V / Octave CV input

  • Octave switch (+1 / 0 / -1 octave)

  • Tune control (range internally adjustable by jumper: ~ 2 semitones / ~ 1 octave / ~ 4 octaves)  

  • Modulation CV input

  • Modulation destination:

    • upper position: exponential frequency modulation (XM)

    • lower position: linear modulation (LM) or pulse width modulation (PM), selectable via internal jumper

  •  Frequency Modulation (FM) or Pulse Width Modulation of the rectangle (PWM)

  • Modulation intensity

  • Triangle output

  • Sawtooth output

  • Rectangle output (about 50% without external PWM)

  • Sync input (hard or soft sync internally selectable via jumper, CEM3340 hard sync type)

  • minute 10 octaves range ( with appropriate external CV)

  • CEM3340 based VCO (triangle core)

  • Each VCO has it's own separate internal +/- power supply for each and every one of the VCOs

Controls, inputs and outputs of the master section:

  • 1V / Octave CV input

  • Octave switch (+1 / 0 / -1 octave)

  • Tune control (range internally adjustable by jumpers: 2 semitones / 1 octave / 4 octaves)  

  • Frequency modulation CV input (FM)

  • FM intensity

  • Triangle sum output

  • Sawtooth sum output

  • Rectangle sum output

  • The VCO is patched this waveform of the VCO in question is removed from the sum (this function can be turned off for each single output socket by means of solder brigdes on the pc board, ie the sum contains then all signals independent of the patching of the single output)

  • CV output (outputs the total CV that is used to control all four VCOs)

  • bus CV (selectable via jumper)

Typical applications:

  • fat sounding monophonic VCO with the possibility to adjust any intervals

  • paraphonic patches in combination with the polyphonic CV interface A-190-5 (all four VCOs processed by one VCF / VCA)

  • full polyphonic patches in combination with the polyphonic CV interface A-190-5 and four complete VCF / VCA sections  

  • VCOs by Means of the Frequency Modulation Features (exponential to linear) and the sync functions

Technical Specifications

  • Width / Width: 18HP / 90.3 mm 
  • Depth / Depth: 40 mm (measured from the back of the front panel) 
  • Power Consumption / Current: + 120mA (+ 12V) / -100mA (-12V)

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