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cacole -- <br />MP3's stored on Flash memory, are real possibilites for on board sound equipement. A number of MP3 players available to consumbers would easily fit inside a HO 40ft box car. The roll your own idea below, would contain perhaps 5 or 6 ic's. Probably fitting on a 1" x 3" PCB. (Of course you'd need a speaker.) <br /> <br />cnchamis -- <br />Take a look the ATMEL's (www.atmel.com) AT89C51SND1 product. Includes a MP3 decoder, USB, and various flavors of FLASH memory interface as well as a general purpose 8051 compatible micro processor. That , a flash, usb port., a bunch of code and a handfuls of appropriate sounds could make exactly what you need. Well it should be low cost, but certainly would be a project!
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