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Get this sound font working with the imuse midi sound system. I don't really think it's possible though.

http://www.bismutnetwork.com/04CrisisGeneralMidi/Soundfont3.0.php

Note even if you can get it working it may have excruciating load times as the sound font uncompressed is like 1.5 Gigs.

Also note he says he had modifications in those demo recordings: like preset levels compression and volume. They aren't just guaranteed to sound like that but you can listen to the imperial march demo and dream . . .