It is completely beyond me why Keynote does not have this VERY BASIC feature of being able
to select among several icons on a slide that trigger different sounds or video clips. Many users have
been asking for this feature from the beginning.
There seems to be NO way of implementing this function, as things stand.
This is the most basic mode in Powerpoint, flexible and extremely useful.
I use Keynote in teaching courses (about music) where I have many sounds and clips
that compare different sounds and musical segments.
Because Keynote does not support this "play icon" feature, I have to always use
Edit rather than Presentation mode. With Lion and the annoying things that they did
with iWork programs (autosave, no "Save As" option), presenting in Edit mode often
triggered the autosave "feature" (in our opinion, this is a program-killing design flaw).
So despite the nicer Apple interface and graphics, I am strongly considering leaving Keynote and
going back to Powerpoint (yechh).