Tony, no critique here. You did great job. I like making my own harmonies, and was never a fan of chordal mode. Why?? Because it's too unpredictable .It chooses it's own harmonies according to chord changes, but that in lots of ways doesn't work. Sometimes it's ok , but mostly not.You can really hear artifacts when voices change. I prefer scale mode always. Especially when I can create my custom scales. It works much better in scale mode. Try it with your digitech. I am not sure if pa900 has user scales. I know I made them on my pa800 while I had it.
Scale mode is more work and more setting up while playing live but you get much better results with harmonies.