message: AudioFilterIIR_F32: add method to reset filter states.
diff: @@ -52,10 +52,12 @@ class AudioFilterIIR_F32 : public AudioStream_F32
  copyCoeff(_b_coeff, b_coeff, _n_coeff);
  copyCoeff(_a_coeff, a_coeff, _n_coeff);
  n_coeff = _n_coeff;
  + resetFilterStates();
  return 0;
  }
  void end(void) { initCoefficientsToPassthru(); disable(); }
  void update(void);
  + void resetFilterStates(void) { for (int i=0; i<IIR_MAX_N_COEFF; i++) filter_states[i]=0.0; }
  //void setBlockDC(void) {} //helper function that sets this up for a first-order HP filter at 20Hz
  