If you export a Keynote 2 presentation with audio in QuickTime format, save it as an Interactive Slideshow movie, and then open the exported movie from the Finder by double-clicking the movie file, you might hear what sounds like an echo. This may happen if you have your Finder window set to Columns view and the Preview pane is set to display content (the Preview disclosure triangle is open).
In this situation, the first time that you click the slideshow file in the Finder to select it, the audio will start playing in the Preview pane. If you then double-click the file to open the slideshow, the slideshow will be playing both in the Finder's Preview pane and in QuickTime Player.
To break-up the double play, either click the Preview disclosure triangle or click a different file in the Finder to stop the Preview pane play. To prevent this from happening in the future, switch the Finder from Columns view to List or Icons view.
