Try adding a control text box
See:
http://www.pptalchemy.co.uk/Live_Text.html
Pay particular attention to the scroll bar settings shown with orange arrows
and set it to scroll bars vertical.

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> I am using PPT to design some stuff for Adobe Captivate and I would really
> like to be able to put text in a text box with an attached slider, so the
> user can scroll up and down an read the text. Is there an add in or something
> that will accomplish this?