A 2nd order (12db per oct roll-off) resonant low pass filter UGen. The B
equalization suite is based on the Second Order Section (SOS) biquad UGen.
Note: Biquad coefficient calculations imply certain amount of CPU overhead.
These plugin UGens contain optimizations such that the coefficients get updated
only when there has been a change to one of the filter's parameters. This can
cause spikes in CPU performance and should be considered when using several of
input signal to be processed.
the reciprocal of Q, hence bandwidth / cutoffFreq.