Changing the Font Size

Hi all,

I'm using Ipe for the graphics in my thesis which uses the classicthesis 
package. All in all, the document has a preamble similar to this:

\documentclass[fontsize=11pt]{scrreprt}
\usepackage[T1]{fontenc}
\usepackage{mathpazo}

This results in \normalsize being 10.95pt, \small being 10 pt, etc. How 
can I set those values for Ipe? Its \normalsize is 10pt, \small is 9pt, 
etc. I checked the basic style sheet, and found the textstrech 
attributes -- is this the correct way to go, or is there a better way to 
set the font size?

Thanks,
Rainer.

PS: This is basically the same question as 
http://lists.science.uu.nl/pipermail/ipe-discuss/2008-December/000776.html, 
which unfortunately was not answered back then...