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Another aspect of filters, however, is RESONANCE. This emphasises the harmonics around the
cutoff frequency so, in the case of a lowpass filter, you might have something like this:
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You can see that as well as boosting harmonics around the cutoff frequency, other harmonics are
also attenuated. If you sweep the cutoff frequency up and down its range (either manually from,
say, a modwheel or automatically from an LFO or envelope generator), instead of the brassy ‘waa’
sound you get with low resonance, you now get a characteristic ‘weeeoow’ sound as each harmonic
is emphasised and then attenuated through the filters frequency range.
The same would be true of a highpass filter:
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In the case of a BANDPASS filter, increasing resonance tends to make the band narrower as well
as accentuating harmonics around the cutoff frequency:
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The same is true of a notch filter except it’s the notch gets narrower (and usually deeper):
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