Wow, this is excellent! Why only the Arduino Mega though?<p>I built an "air" MIDI controller with a regular Arduino Uno and cheap HC-SR04 sensors. This is me playing it: <a href="https://www.youtube.com/watch?v=tgH-WU-9CZA" rel="nofollow">https://www.youtube.com/watch?v=tgH-WU-9CZA</a> (Sorry for the silly wig).<p>Flashing UsbMidiKlik to have a compliant MIDI device is kind of a pain (but not horrible).<p>I may try to experiment with this and a Teensy... Thanks!!