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Dark EnerGy II

DOEPFER

Functions

3.2. The Modules

3.2.1. VCO

The VCO, or alternatively the external audio input, is the source of Dark Energy II‘s sonic „crude material“.

The VCO produces the basic waveforms triangular, sawtooth, and square wave with variable pulsewidth.

The module has modulation inputs for frequency (pitch) and pulsewidth. The frequency range covers

approx. 10 Hz to 12 kHz.

The VCO has the following controls:

•Manualtuningcontrol

Thispotisusedforsharporatne-tuningofthepitch.Aninternaljumperselectsthe

range of the pot between approx. +/- 0.5 octave or +/- 2.5 octaves. The default setting

is +/- 0.5 octave.

•Rangeswitch-1/0/+1octave

This switch selects the tuning range.

•FM(frequencymodulation)control

This pot is located in the pitch control input section of the VCO. It adjusts the pitch mo-

dulationdepth of the selected modulation source (LFO1 or ADSR envelope). This pot

has exponential response to yield a higher resolution in the lower pitch range.

•FMSourceswitch

This switch selects the frequency modulation source of the VCO. The choices are

LFO1, envelope (ADSR), or no source at all (off). The ADSR generates a „one shot“

pitch contour, which is characteristic of e.g. certain drum- and percussion-sounds.

LFO1 produces a periodic and continuous modulation. „Low“ frequency settings of

LFO1 will produce vibrato. If LFO1 runs at audio rate (high), the VCO will generate

quite noisy textures.

•ManualPulsewidthcontrol

This pot changes the pulsewidth of the square wave. Altering the symmetry of the

waveform from wide to narrow square alters its harmonic content and thus the

timbre of the signal. In center position, the VCO produces a rectangular (square) signal

(a).Turningclockwiseorcounter-clockwiserespectivelyrstnarrowsthepulsewidth

until, at its most extreme setting, the VCO stops oscillating and no pulse wave signal is

audible anymore.

•PWM(Pulsewidthmodulation)control

Modulating the pulsewidth creates very interesting textures. This pot is located in the pulsewidth control in-

put section of the VCO. It adjusts the pulsewidth modulation depth of the modulation source selected (LFO2

or ADSR envelope.) At high modulation depths and/or narrow pulsewidth settings (manual pulsewidth

control close to fully clockwise / fully counter-clockwise), the modulation depth might exceed the maximum

value of the pulsewidth range and the waveform will become inaudible. As a result, you will hear drop-outs

in the audio signal. This is perfectly normal and can be used creatively as an interesting „gate“-like effect.

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