David, I just joined this forum. You probably have solved the issue of a small midi file player long ago. But you may want to look into the Roland MT90s, a stand-alone midi file player. They're not cheap (around $400). Sometimes you can find one on Ebay. Ebay is also a source for the (discontinued) predecessors such as MT80S or MT 120 or 120S. The "S" means built-in speakers.

Susan Bagot