DuckCorp Dico

Found one definition

1.                 From The Jargon File (version 4.4.7, 29 Dec 2003):
                   
   
   
                   
                     
   knobs
    pl.n.
       Configurable options, even in software and even those you can't adjust in
       real time. Anything you can twiddle is a knob. “Has this PNG viewer got
       an alpha knob?” Software may be described as having “knobs and switches” or
       occasionally “knobs and lights”. See also nerd knob