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Thru Zero Complex Oscillator
A new complex oscillator, featuring two independent VCO's. Both voices have a unique signal path and flavour. Complex cross modulations entangle them together, opening up completely new timbral territories.
Features include the Thru Zero trinity; Frequency, Phase and Amplitude modulation.
Each oscillator also has its own Low Pass Filter, which works great to mellow the harsher tones from complex intermodulations.
Each VCO has great tracking and temperature stability, there is no distinction between a carrier and modulator.
The FM bus lets you modulate the index of each individual voice, with linear and exponential inputs for external sources. There are also inputs for Sync in, with both soft and hard sync.
The left VCO signal chain starts with a shape function, that let's you morph between triangle and saw. This waveform is also available as a separate output.
Next is a sinusoidal wavefolder, which changes its response dramaticaly based on shape of the waveform. The circuit is based on a modified version of a design by Barrie Gilbert from 1977, popularized by Open-Music-Labs (used with permission).
This circuit also creates the possibility of Thru Zero Phase Modulation, here the depth is controlled with the third slider. The source is normaled to VCO 2, but external modulation sources can be patched in, and the depth can also be modulated with CV.
Lastly there's a 2-pole Low Pass Filter, before going out the MAIN output. All parameters can be CV controlled, and feature handy attenuators at the inputs.
The first slider is a continuous waveform shaper, that morphs from sine to tri to saw.
This waveform then enters the Thru Zero Amplitude Modulation (Ringmod) section. The slider sets the depth of modulation, with the source normalized to VCO 1. The depth can be CV controlled, and an external source can be patched as well. The result is also available on a separate output, pre wavefolder / filter (VCO 2 sine).
The third slider is a wavefolder, it's based around a novel wavefolding topology, with a unique and more aggressive sound compared to the sinusoidal folder of VCO 1.
The wavefolded signal goes into a 2 pole Low Pass Filter, and out of the MAIN output.
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