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This virtual robot plays any MIDI file you throw at it pretty much in real time. This is a commercial venture on a shoestring budget. Even if it makes no money though it's been a very educational and enjoyable thing to work on. You can download the software to a Windows PC and try it for free (http://roboticensemble.com). I have done all of the programming. The software is pretty much complete, although you may find a few bugs. The program has a Qt interface and depends on other high quality libraries ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/midi-digits-pianist