You can make it talk by downloading a free app Eyes-Free Project's Text-To-Speech Extensions. It is pretty cool. So far, I have enjoyed the app. We have not tried it on an investigation yet, but we do have a couple of places we are going to try it out. We already have info about the sites, so it will help us determine how random the words are.
I figure it was worth a shot. And if it works, it is a lot cheaper than $200 for an official Ovilus or a Puck. Plus, you can email the list of words to yourself for verification later.