A-110-4 Thru Zero Quad VCO
| Manufacturer | Doepfer |
| Function | Synthesizer (Oscillator) |
| Country | Germany |
| Form Factor | Modular - Eurorack |
| Signal Path | Analog Hardware |
| Dimensions | 8HP / 10HP / 40.3 mm / 60 mm |
| Power | 90 mA |
| Channels | 1 Voice |
| Notes | Thru Zero Quadrature - VCO oscillator generates sine and cosine waveforms at the same time. Special edition with additional output amplifier 2x Control sections: Linear and exponential Controller for XTune, XFM, LFrq and LFM |