Something that’s not obvious about the Doepfer Dark Energy II synthesizer is that offers a range of internal expansion options.
This video, via creativegallerysynth, demonstrates an expansion box that exposes these hidden features. The expansion box offers: triangle output, Reset, Direction and Rectangle output for LFO 1&2. (JP10 & JP11 of the voice board). Next to this, the VCF Lowpass, Bandpass and Highpass are taken out to individual outputs. (JP6 of the voice board)
4 signals can be mixed with an extra A-138 mixer which is powered by the powersupply of the Dark Energy II. (JP14 of the interface board, 20mA max).