SPKitAmplitudeAnalyzer();
SPKitError setInput(SPKitProcessor *);
void setCutOffFreq(SPKitFloat val);
int getSample(SPKitSample &outputSample, SPKitProcessor *caller);
void convertSample(SPKitSample &smp);
SPKitFloat cutOff;
int index;
SPKitFloat km2, km1, k0, k1, k2;
SPKitFloat buf[256];
Authors: Jarno Wuolijoki, Pilvari Pirtola