First experiment plodded through to buzz out having set up the environment (including loader and USB driver).
Now things might be fun as I got an older V2 model (with ATmega16U4 instead of the ATmega32U4) so a bit behind on things it is. I jumped at the board as they had them cheap because they botched the USB socket mount (apparentlly) – nothing a drop of epoxy wont fix.
In any event.
LED lit.
Now we can move through to the more interesting examples.