Cutoff is used to block certain frequencies from a sound. In a
standard LP (Low Pass) cut/reso filter, cutoff determines the range of high
frequencies to be cut. However, in modern software and hardware synthesizers
you will notice that cut/reso filter comes in many "flavors", such as HP (High
Pass), which cuts the low frequencies of the sound instead.
Resonance effect originates from an artifact in the original cutoff
filter used in old hardware synthesizers. It is narrow band of frequencies,
near the cutoff level, where the sound is amplified. Today this artifact can
be easily avoided, but it is still available though, because it can be used as
a special effect.
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