I put together a MIDI-in device according to the schematic on http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1187962258 on the old forum (and I read every post on said thread). However, when I connect my midi keyboard and play on it, my arduino's output puzzles me (output and code below). For one …

Interpreting MIDI input... seems off

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