Check out this knob!, Only $500 or so. Options

[Doctor]

Not a joke

[kebab]

And the funny thing is that this isn't the wildest thing I've ever seen sold for your stereo- (some) audiophiles are among the dumbest people on the planet and will shell out for;
A pen that when used to mark CD's makes them sound better.
A trimmer that for only $500 will trim the rough edges of your CD's and stop them wobbling during playback.
Speaker cables for $2000 a metre marked with arrows that show the direction of the flow of electricity (no really ).
Wooden stands with curly sticks on top that stand in the corner of the room and make the stereo sound more gooder.
Holographic stickers that make CD's and indeed anything else they will adhere to sound better.
And my favourite- C37 lacquer that is attuned to the human ear and makes stuff you coat with it sound better- a snip at $300 for 50ml.

Funnily enough, when tested using actual test protocols that ensure a fair comparison, no difference can be heard. Audiophiles explain this by saying "all these things can only be detected if you know what you're listening to"     

We are ALL in the wrong line of business- roll on Ringer Audio Enhancements Ltd.

So you have been round to Nelly's a few times before then!