H-020 Harmonics generator with LFO for eurorack / Doepfer A100 system. Based on three comparators (CV1, CV2, CV3, this third with inbuilt LFO – speed&amount), “Color” knob for sound...

A-110-4 is a so-called Thru Zero Quadrature VCO. The term "quadrature" means in this connection that the oscillator outputs sine and cosine waveforms simultaneously. The term "Thru-Zero" means that even "negative"...