Is it possible that you could add a cool, alien-sounding "filter" effect to Obi-Wan's voice as he hangs in the stasis cell on Geonosis? I always figured that since he was behind some sort of energy containment chamber, his voice would sound as if it were, too. The best idea I can think of for this would be how Mystique sounds in the X-Men films, maybe even more pronounced than that.
What do you think?