@antisvin thanks for the for the suggestion. I just got the code setup in VS and I’m starting to take advantage of debouncing buttons and other changes to non audio items (like knobs) that don’t work without changes to Arduino code. I’ll give SPI another try when I get to that point when coding. I found this post of yours for sample SPI DMA project and it looks very promising though I would only need the polling version.
I also need to add a looper, reverb, flanger, and a 3 button footswitch so by the time I get back around to SPI it will hopefully coincide with the promised E-S updates.
I also want to thank you for your concern and time spent while helping me. It is very much welcomed and appreciated.