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The addition of a modular synth filter within your Eurorack and modular synthesizer allows you to further shape the sound created by your oscillator. Most modular synth filters have a very simple design but provide endless possibilities in shaping a unique sound.
It first starts with the cutoff point. Most modular synth filters will default as a low-pass filter, which means increasing the filter will begin to shave off the high frequencies. In a more advanced modular design, you can choose between a low-pass and hi-pass filter. A hi-pass filter work opposite to the low pass, where increasing the depth of the filter will begin to shave off low frequencies.
You then have control of the peak, or resonance point. The resonance point is used to control how much signal is routed from the filter’s output back into its input. As the resonance is increased, a peak in amplitude is created at the cutoff frequency, allowing you to achieve some really aggressive sounds. In most filters, when the resonance is pushed above a certain point, it will cause the filter to self-oscillate, allowing the filter to further expand on the initial sound generated by the modular oscillators.
Most filters add a “Drive” circuit, which adds the sound of tube-like warmth or hard clipping to the signal. Using the drive circuit in combination with the oscillators and filters can give your sound a unique tonal edge, as well as make them more responsive to the changes in filter resonance.
For questions on finding the right filter for your Eurorack and modular synthesizer setup, be sure to contact your sales rep at Vintage King.