Let's Make Robots!

How to add sound?

Hello, i was wondering how to add sound to this
http://letsmakerobots.com/start
I was thinking to break an old mp3 and connect it to the board :D but that is way too retarded
I know i can make my own board on Orcad, with a chip for memory and а processor chip + amplifier,
but i have no idea what to use and how to do it (Or at least a little bit, can work with Orcad <3)

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There are a couple pages that talk about controlable MP3 boards. I saw one of them on ebay for $5 to $10 shipped.