Filter asuperstop
  Apply high order Butterworth band-stop filter.
    slice threading supported
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (audio)
asuperstop AVOptions:
  centerf           <double>     ..F.A....T. set center frequency (from 2 to 999999) (default 1000)
  order             <int>        ..F.A....T. set filter order (from 4 to 20) (default 4)
  qfactor           <double>     ..F.A....T. set Q-factor (from 0.01 to 100) (default 1)
  level             <double>     ..F.A....T. set input level (from 0 to 2) (default 1)

This filter has support for timeline through the 'enable' option.

