Vorg

Included in: VultCompacts

Vorg is a low/high pass filter based on a modernized Operational Transconductance Amplifier version of the MS-20 filter. Vorg is the first module that I developed with the idea of making it feel exactly as a real eurorack module. This considers the spacing between the knobs and sizes. Vorg is also part of Freak. Using it with Freak allows modulating the Resonance and Drive controls.

Documentation

• Cutoff: Defines the frequency at which the filters starts attenuating frequencies.
• CV1 & CV2: these pairs of input jack and attenuation knob are the modulation sources for the Cutoff control. Notice that the knobs are attenuators not attenuverters.
• Resonance: the resonance boost the frequencies near the cutoff frequency. Increase this knob and you will hear the personality of the filter. After some point the filter will start self-oscillating and can be used as a sound generator.
• Drive: controls the amount of signal that enters to the filter. Increasing the drive will cause the filter to saturate which adds interesting harmonics to the sound.
• Mode: pressing the button switches between low pass and high pass filter mode. The current mode is shown by the LED lights in the panel.
• In: input to the filter.
• Out: output of the filter.

Patching Tips

The filter section in the real MS-20 consists of two filters: one HP and one LP. You can easily recreate this behavior with Vorg by creating two instances and experimenting different ways of connecting them.

Videos

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Making of Vorg

These are the slides I prepared for a presentation where I talk about the process of modeling Vorg.