Attenuates or boosts a frequency band.
| in | 
 The input signal.  | 
| freq | 
 Center frequency of the band in Hertz.  | 
| rq | 
 The reciprocal of Q (bandwidth / cutoffFreq).  | 
| db | 
 Amount of boost (db > 0) or attenuation (db < 0) of the frequency band.  | 
| mul | 
 Output will be multiplied by this value.  | 
| add | 
 This value will be added to the output.  |