making a bar graph animate up and down as you move a slider

Hey Eric.  If you're referring to this slide:

this bar graph was created using states and triggers.  The slider has 32 stops, and each of those bars has 32 states.  Triggers are used to move the bars according to the position of the slider.

Slider Format:

States:

Triggers:

So, depending on how smooth you'd like the action to be, you're going to be fine tuning the movement with a number of states and slider stops... which is why I was lamenting the work involved in creating that effect in my praise for Walt.  :)

Pick your poison:  a little time and elbow grease, or an alternative workaround like Walt's.  Either way, it's a great effect!