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What is a filter, and what does it do?
Filter (VCF): The timbre, also known as the color or nature of your sound is shaped by the filter. It can accentuate or attenuate certain frequency ranges. It's basically a specialized EQ. Synths can have hi, low, and band pass filters. A resonance control really brightens (to the point of squeeling self-oscillation) certain frequencies around the cutoff point. You adjust the cutoff to dial in where the filter begins affecting frequencies. Many filters have an envelope as well, which is used to adjust the attack, decay, sustain and release of the filter's effect on the sound being processed.
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