I assembled the untztrument 8x8 kit and I'm using a micro (which I think is almost exactly the same as the Leo). The trellis example worked fine, however as soon as I tried to follow the actual software setup for midi control the amount of conflicting information that I got from different sources was insane.
I followed the guide up until uploading the untztrument code, and now my micro appears as "teensy midi" with no serial communication, unplugging and replugging does nothing to help me reprogram the board.
I had to use the 1.6.5 version of the IDE because teensyduino wouldnt work with 1.0.5 (its also a bit silly to use an ancient version of the IDE), and I needed to drop the TeeOnArdu folder into a folder called AVR in the hardware folder to be able to use the board.
I'm using Windows 10.
What do I do? I'd rather not buy a new Leo, and right now this project feels like I've wasted ~$200AUD and a couple of frustrated nights.