Gotcha. That is frustrating. Let’s see if we can’t unravel this.
Okay, so you’ve run the Arduino code, and confirmed that your pads do light up when addressed, outside of Node. This is good.
And the Node based examples you’re running are exactly as provided in the Grid studies?
(meaning, we can also eliminate your code, without asking Node based users to try it on their own grids. if there are any.)
That leaves… a user script from syzmonkaliski, which isn’t what the grid studies document, and which sounds like your single point of failure.
So, your choices are:
troubleshoot syzmonkaliski’s code, perhaps with syzmonkaliski’s assistance. (eg, submit an issue to his github and see what happens)
figure out how to adapt the Grid Studies to leverage monode instead of the other two serialosc implementations, as you have identified that monode works for you where the others do not.
Neither of which (if any of the moderators are reading) belong in the thread to which your question was moved.
Does that sound about right?