![]() The control labelled LFM provides linear audio-rate frequency modulation of the VCF by the triangle waveform of the VCO allowing for other rich sounds. The filter cut-off can be controlled either by the envelope or LFO2, the level control being labelled XFM for exponential frequency modulation. The tracking is not as precise as the VCO and it is not temperature compensated, but the sine tracks pretty well over a couple of octaves without adjustment. The filter resonance can be turned up such that the filter self-oscillates, allowing a sine-wave sound to be blended in with the other waveforms. Whereas the A-111-5 has the usual silver finish of Doepfer modules, the Dark Energy's case is an attractive black finish with retro-style black knobs, toggle switches and wooden end panels. The filter is a 24 dB/octave Curtis filter with VCO tracking, which can be set to off, half or full tracking. The Dark Energy owes its existence directly to Doepfer's modular products, it is the module in a rugged, fully-enclosed metal housing. ![]() The VCA level can be increased so that drones can be produced, or it can be controlled by the envelope or LFO1, again with filter FM capabilities with the LFO on the high setting. With the LFOs set in the audio range, interesting FM sounds can be achieved, but unfortunately the LFO frequency cannot track the keyboard. ![]()
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