Filter asubboost
  Boost subwoofer frequencies.
    slice threading supported
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (audio)
asubboost AVOptions:
  dry               <double>     ..F.A....T set dry gain (from 0 to 1) (default 0.7)
  wet               <double>     ..F.A....T set wet gain (from 0 to 1) (default 0.7)
  decay             <double>     ..F.A....T set decay (from 0 to 1) (default 0.7)
  feedback          <double>     ..F.A....T set feedback (from 0 to 1) (default 0.9)
  cutoff            <double>     ..F.A....T set cutoff (from 50 to 900) (default 100)
  slope             <double>     ..F.A....T set slope (from 0.0001 to 1) (default 0.5)
  delay             <double>     ..F.A....T set delay (from 1 to 100) (default 20)

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

