VCO is a single VCO laid out in a similar way to the VCO section you would find on a monosynth. VCO includes a glide (slew) function, so this is a great bonus. The VCO can go down to low frequencies so they can be used as an LFO.

The VCO or signal generator, commonly found on most music synthesizers consist of an exponential amplifier, a resetable 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 of a square wave either manually or with a voltage (pulse width modulation).

The VCO has a wide ranging tune control. Turning Tune alters the basic pitch of the oscillator.

Turning up 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!

You can alter 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.

This sets the output volume of the sawtooth waveform output.

This sets the output volume of the square waveform output.

This socket is the pitch CV control input and is used to control the pitch of the oscillator.

This is a pulse width control CV input. Use a -12 to +12V voltage in this socket to alter the pulse width of the oscillator square wave.

This is an oscillator Sync reset input.

This is the audio output for the sawtooth waveform. Its level is affected by the sawtooth level pot.

This is the audio output for the square waveform. Its level is affected by the square level pot.

CV

PW

SYNC

SAW

SQUARE

Tune

Glide

Pulse Width

Saw Level

Square Level

12HP

+/-12V, GND using Doepfer power socket.