resonk — A second-order resonant filter.
iscl (optional, default=0) -- coded scaling factor for resonators. A value of 1 signifies a peak response factor of 1, i.e. all frequencies other than kcf are attenuated in accordance with the (normalized) response curve. A value of 2 raises the response factor so that its overall RMS value equals 1. (This intended equalization of input and output power assumes all frequencies are physically present; hence it is most applicable to white noise.) A zero value signifies no scaling of the signal, leaving that to some later adjustment (see balance). The default value is 0.
iskip (optional, default=0) -- initial disposition of internal data space. Since filtering incorporates a feedback loop of previous output, the initial status of the storage space used is significant. A zero value will clear the space; a non-zero value will allow previous information to remain. The default value is 0.
kres -- the output signal at control-rate.
ksig -- the input signal at control-rate.
kcf -- the center frequency of the filter, or frequency position of the peak response.
kbw -- bandwidth of the filter (the Hz difference between the upper and lower half-power points).
resonk is like reson except its output is at control-rate rather than audio rate.