Check this out.
This thing is amazing! converts your NES into MIDI. Sure you can replicate the basic 5 channels on Reason, Ableton, etc... But this goes to show how more impressive you can be using your original NES. I would recommend using the NES toploader though, a lot more user friendly.
Here's a link if any of you are interested.
http://www.wayfar.net/0xf00000_overview.php