The VCO-11 is an advanced band limited voltage controlled oscillator.


CONTROLS

OCT

The octave button changes the base frequency in octave increments and has a range of 4 octaves.

TUNE

The tune knob changes the base frequency by +/- 12.00 semitones.

WAVE

The wave button changes the waveform to sine, triangle, pulse, or sawtooth.

PULSE WIDTH

The pulse width knob varies the duty cycle of the pulse waveform with a range of 1-99%.

F.MOD AMT

The frequency modulation amount knob applies the F.MOD socket input to the frequency.

PWM AMT

The pulse width modulation amount knob applies the PWM socket input to the width of the pulse waveform.


SOCKETS

F.MOD

Frequency modulation input.

1V/OCT

Keyboard note value input in 1 volt per octave.

SYNC

Sync trigger input.

PWM

Pulse width modulation input.

OUT

Oscillator output.

TYPE

Source

WAVEFORMS

Sine, triangle, pulse, sawtooth

FREQUENCY RANGE

MIDI note C0 (16.35 hz) to C9 (16.74 khz)

F.MOD RANGE

+/- 3 octaves


MORE INFORMATION

The VCO-11 is an advanced version of the VCO-01 oscillator.

The VCO-11 has four different waveforms to choose from.

The sine wave has no additional harmonics.

The triangle wave has only odd harmonics, with every other harmonic inverted.

The pulse wave has a complex set of harmonics depending on what the pulse width position is. At 50% pulse width, the harmonic content is only odd harmonics which is the same as a square wave.

The saw wave contains all harmonics.

TIP

Modulating the pulse width creates a nice phaser type effect.

Sync is a great way to create harmonically rich waveforms. Try syncing one oscillator with another and detune the two. To sync two oscillators, take the output of one oscillator and run it into the SYNC input socket. When the first oscillators waveform phase changes to positive, the slave oscillator will reset its phase to match. This effect works best when the slave oscillator is an octave or more higher than the master oscillator and if the tuning of the two are slightly off.

Sync can not only be used to sync two oscillators, but it can also be used to retrigger the oscillator every time you hit a note by running the keyboard GATE signal into the SYNC input socket. This may be useful for very precise control of your waveform.