The Voltage Modular version of the Zeroscillator is a software clone of Mark's very popular Zeroscillator hardware module he designed in 2005. It was manufactured and sold by Cyndustries in a wide variety of formats. The hardware versions of the mono Zeroscillator module are priced at around $750 and up. There is no polyphonic version of the Zeroscillator hardware module. The Poly Zeroscillator software module only exists here in the digital domain. Had it ever existed in hardware, it would have cost thousands more.
The Zeroscillator is a VCO with a wide variety of features and modulations. It's main purpose is to do linear, through-zero frequency modulation (TZFM) synthesis., you don't have to start with just a sine wave. Saw, square with PWM, and triangle are available too. There are also 2 voltage controlled wave morphers provided which continuously go from triangle through sine to square. Taking outputs from these and modulating the shapes differently creates great stereo effects. The 4 morph outputs are also in quadrature, meaning each output is 90 degrees apart. This is great for LFO use to make things sound swirly and for simulating panning around a room.
Poly Zeroscillator works exactly the same as the mono version with a few minor exceptions (so please see the description for a full explanation of the mono version). This module never existed in the hardware world, so Voltage Modular users get to be the first to hear what it might have sounded like.
All inputs on the Poly Zeroscillator are "monopoly" inputs. That is, both types of jacks are provided on every input, so you can modulate with a mono or poly source in any combination without the need for splitter or combiner "glue" modules. Using a mono input results in all voices responding equally to the signal. Both jacks share an attenuverter.
Like the MRB Poly Laboratory VCO, the Poly Zeroscillator has a SPREAD switch. Activating it, changes the FINE TUNE knob into a SPREAD knob which spreads the individual voices above and below the center pitch. You can use this for detuning or fat unison, or phase unlocking the different voices for LFO use. There are no LEDs because we would need 32 of them, and that's just not practical and a waste of CPU.
Read the full description of the Zeroscillator to learn more about the different modulations, jacks, controls and operation.