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I haven't but I do believe MIDI is indeed TTL (5V). This sorta thing kinda reminds me of the PC tracker days when someone (myself included) would load up say config.sys as a wave file and use that to make music :) Could be really neat to try! One thing you will want to consider is that at least DIN MIDI connections use opto-isolators to prevent damage and that might be something you may want to look at (or perhaps use say a cheap USB to MIDI device). It probably won't break anything but I'd be worth taking a look at those circuits. There's several Arduino MIDI boards and things so it should be an easy circuit to track down.