Ward Yeah, that was the issue

Great! I guess I could've asked you to share your user code to spot it!

That looks cool, what are you building?

    I'm building a 6 track synthesizer/instrument. The panel you are seeing is an interface to edit, store and recall presets. The LED's are going to be used to display the track you are editing (color) and what it's current value is (brightness).

    The instrument is taking shape but not done yet, still a lot of work on both the hard- and software side. I'll make a more in-depth post in the future about what it does and how it sounds.

    3 months later