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About Subtractive Synthesis Page 83
When you apply resonance, the frequencies just around the cutoff point of the filter will be emphasized
(louder). As you increase the Resonance further and further, the filter will start to behave more an more
like a bandpass filter, where only the frequencies around the cutoff point are let through. The filter will
start to “ring”, which means it almost sounds like it is
adding frequencies to the sound. If the Resonance
is then raised even further (on some synthesizers) the filter will start to self-oscillate, that is produce
sound of its own, just like an oscillator.
High Resonance values are also visible in the waveform. They appear as a “superimposed” waveform
with a frequency equivalent to the filter’s cutoff frequency. The three examples above show the same
wave with increased resonance.
If you add Resonance to a sound and then vary the Cutoff frequency (for example with an envelope) you
will get a very typical synthesizer sound.
Amplitude
Frequency
Filter
Frequency
Q=0.5
Q=1
Q=4
Q=2
Q=0.5
Q=1
Q=2