I'm going to stick my head out and say, "yes". This is what the specs say, "and up to 99 songs (1.5MB total), which can be loaded in via USB." Looks like you can store your uploaded MIDI files on the EXR-3.
$420 is more then the $340 you wanted to spend . Music123 has it for $17/month.
Starkeeper

[This message has been edited by Starkeeper (edited 11-15-2004).]
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I play Roland EM20 and Yamaha PSR550