message: AudioFilterTimeWeighting_F32: improve comments
diff: #define TIME_CONST_SLOW (1.0f)
  #define TIME_CONST_FAST (0.125f)
  -//Time weighting for sound level meter. Defaults to SLOW
  +//Exponential time weighting for traditional (ie, old style) sound level meter.
  +// Default time constant is SLOW
  class AudioFilterTimeWeighting_F32 : public AudioStream_F32
  {
  public:
  