Doepfer Dark Energy I (device no longer available) - Manual (Page 18)

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Dark EnerGy DOEPFER Functionality
3.2.5. LFO1 and LFO2
A Low Frequency Oscillator produces a pulsating signal, mostly in the subaudio range, which can be used
to generate periodic changes of several soundparameters. Dark Energy provides two identical LFOs.
The LFOs provide the following controls:
• Frequency knob
This knob controls the LFO frequency resp. modulation speed.
• LFO range switch
This switch provides three different ranges for the LFO frequency: „Low“ (periods
of up to a minute) / „Audio“ (above 5 kHz) / „Medium“ (usual LFO range – several
seconds up to some 10th Hertz).
Since Dark Energy‘s LFOs produce frequencies up to the audiorange, they can be
used to generate FM-effects with VCO-pitch, VCO-pulswidth and VCF-frequency
as well as AM-effects (VCA). Use this feature to create interesting and noisy
soundeffects.
• Dual coloured LED (yellow/red) show positive and negative waveform halfs. Abo-
ve frequencies of approx. 30 Hz, the LEDs seem to light orange.
• Waveform switch
This switch selects the waveform of the LFO signal (triangle / off / square) or shuts
the LFO off. Triangle suits soft modulations, square generates „jumps“.
• LFO1 Output socket
The inverted output signal of LFO1 is provided at this socket. You may use it for additional modulation
paths.
Internal jumpers provide the non-inverted signal of LFO1 or the ADSR control voltage at this socket. You
may configure this jumper to your needs, but please keep in mind that opening Dark Energy‘s casing needs
some basic skills in handiwork. If you cannot cope with this, please feel free to contact Doepfer anytime.
You will find some more information in the section 3.5. „Modifications“ on page 25.