Thank you so much for the quick reply. It's really amazing everything you do with Teensy and then being so willing to help out. I might take a stab at the Flexio approach to see if I can get it going on one Teensy 4.0. I don't really know what I'm gonna do but I'll post on here whenever I get it...
I am trying to build a very large POV(persistance of vision) display and have, as someone who is pretty new to Teensy and Arduino generally, I seem to have bitten off more than I can chew, or at least more than I planned on chewing. Anyways, I have calculated that I need to refresh my 4...