Has anyone toyed with the BeagleBone Greens released this past August? http://dmesgd.nycbug.org/index.cgi?action=dmesgd&do=view&id=2831 http://dmesgd.nycbug.org/index.cgi?action=dmesgd&do=view&id=2830 In particular, I'm curious about the numerous 4-pin 'grooves' available, and how they are working. g