Thanks Ray. The way you've implemented the Arduino and the current sinks with this design is excellent. As you've already seen on my Instagram, I've been transferring the breadboard over to the PCB today - also an excellent design, love the drilling template and break off parts.
Here's a few build photos....
I also did a timelapse, I'l post that too as soon as I edit.
Only issue I had was human error, I soldered the Footswitch onto the wrong side!

Took a bit of desoldering to get it corrected. Always manage to make one error when I'm building, I think of it as my payment to the deity of pedal builders -- or something like that
Also, thanks Andrew, I implemented some socket pins for debug, so I could jumper a wire across too, good thinking.
Having the voltage test points in the guide is a great idea and enabled me to test my soldering before installing the chips. All in all a good build, going to box it up this week. Look forward to playing around with the code over the next few weeks, will post anything interesting here.
Stu