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Say I want a slider that controls the value of $x$ and another slider that controls the value of $2x$, how would I go about it?

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Is it purely abstract question or you need this for something else? I am curios what you're trying to achieve with this. –  Vitaliy Kaurov Feb 5 '12 at 22:47
    
Need this for a tool that helps me to play around with speed (split time) / time / distance for the rowing machine. –  Peteris Feb 6 '12 at 10:20
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up vote 12 down vote accepted

This?

{Slider[Dynamic[x], {0, 10}], 
 Slider[Dynamic[2 x, Set[x, #/2] &], {0, 20}]}

enter image description here

The documentation explains, under More Information, that "Dynamic[expr,f] makes interactive operations not change expr except by virtue of the evaluation of f[val,expr]. ". Otherwise, Mathematica attempts to assign a value to 2x.

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