It's been a while, but I have finally got around to doing a little more on this project.

Hardware - I have decided to switch out my footswitch for an off the shelf Line6 FB4. It looks smarter, is smaller, and will be more reliable in the long run.

Tomorrow I will solder up an Ethernet breakout cable to allow me to use the FB4 with the Arduino Pro Micro.

Software - I did a bit of tweaking to the jack config, and it already seems a whole lot more reliable!

Woohoo!