@mike, if I recall (I wasn’t taking notes) I had to rename /hardware-def to /hardware in my /Users/[me]/Documents/Arduino folder (this is on Windows) before Arduino Studio picked up the Kilomux board definition. Does that work?
Overall I’ve got these directories with things in them:
/Documents/Arduino/hardware/yaeltex/samd/*
/Documents/Arduino/libraries/Adafruit_NeoPixel/*
/Documents/Arduino/libraries/extEEPROM-master/*
/Documents/Arduino/libraries/MIDI-LIB-USB/*
/Documents/Arduino/libraries/MIDIUSB/*
and it’s working fine.
If you want to compile the aux firmware, which handles all of the low-level LED stuff except the StatusLED, see here and here (those are side notes from the main thread and should probably get moved to their own thread).
(BTW, I think that you’re also experiencing at least one of the two problems @francoytx and I are debugging in that thread–not sure yet if the problems are the same or related)