Analogue Solutions Concussor module VCO - Ring Mod


  • Tune
    alters the basic pitch of the oscillator.
  • Glide
    adds portamento to the oscillator, so the pitch will bend (slide) up or down to each note (as opposed to a sudden change). The higher the setting, the longer the oscillator takes to reach its new note. Not many VCO modules give you the all important Glide control as standard!
  • Pulse Width
    alters the pulse width (duty cycle) of the square wave. Turning this gives a sound similar to chorusing. In the centre position a square wave is produced.
  • Sawtooth Level
    sets the output volume of the sawtooth waveform output.
  • Square Level
    sets the output volume of the square waveform output.


  • CV in
    pitch CV control input and is used to control the pitch of the oscillator.
  • PW
    pulse width control CV input. Use a -12 to +12V voltage in this socket to alter the pulse width of the oscillator square wave.
  • Sync In
    oscillator Sync reset input.
  • Sawtooth Out
    audio output for the sawtooth waveform. Its level is affected by the sawtooth level pot.
  • Square Out
    audio output for the square waveform. Its level is affected by the square level pot.
  • RM X input
    X audio input to the Ring Modulator
  • RM Y input
    Y audio input to the Ring Modulator
  • RM output
    RM output


Analogue Solutions


VCO-RM is a single high-end VCO laid out in a similar way to the VCO section you would find on a monosynth. The VCO-RM has advantages over VCOs found in other modular synths in that it is a complete VCO solution. Most VCO modules do not include a glide (slew) function, so this is a great bonus. It also has a complete and independent Ring Modulator. This can be used on its own, or you can patch the oscillator into the RM, and along with another audio source gives you great Ring Mod'd sounds.

The VCO can go down to low frequencies so they can be used as an LFO.

Voltage Controlled Oscillators (VCOs) in general

The VCO or signal generator commonly found on most music synthesizers consist of an exponential amplifier, a resettable integrator and waveshaping circuitry. ‘Voltage Controlled Oscillator' means an oscillator whose frequency can be controlled by an external voltage.

A VCO is responisble for the pitch of a sound and its basic timbre. Most VCOs will offer a variety of wave forms. Some VCOs offer the facility to alter the pulse width.

Ring Modulation

The VCO-RM features a high quality Ring Modulator very similar to those found in the Roland System 100m, EMS VCS3 and ARP2600.

What the RM does is take 2 audio inputs, which we will call X and Y, then produce an output that contains the original frequencies X and Y, as well as the sum and differences of X and Y (X+Y, X-Y).

In non-technical speak, the RM best produces metallic sounding bell and clang sounds. The output is rich in harmonics and can often sound quite abbrasive. So filtering is neccessary and the sound is best used for effects. The RM is a vital processor producing it's own unique sound vital in an system.

RM In Use

Basically experiment with any two audio sources. The type of input signal (waveform) and pitch will alter the output. By slowly changing the pitch of one input some dramatic sounds can be produced. Note, the RM is completelty independent from the VCO.

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analog solutions vco-rm

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