Okay I'm half tempted to leave it as Tuscan (but only half =) Adding a button that you can press to inject a MIDI marker is an interesting idea, for my own use

Okay I'm half tempted to leave it as Tuscan (but only half =) Adding a button that you can press to inject a MIDI marker is an interesting idea, for my own use (once I turn it into a non-breadboard version) is to just hang off the back of my controller so that wouldn't be a convenient place to interact with it, but if you have it just sitting in reach, I can see that being super useful. I've filed https://github.com/Pomax/arduino-midi-recorder/issues/3 https://github.com/Pomax/arduino-midi-recorder/issues/3, if you want to hop on that, you're more than welcome. As for tuning: there are many, but it really depends on what you're playing, so if the arduino was driving its own little mini-synth, you'd probably want to add some tunings that would allow you to at least match the various tunings you'll find in any custom-tunable stage piano. Being able to set the tuning to Well Tempered or Werckmeister when your controller or Piano VSTi is currently set to that would be rather convenient, but only if we're not listening to Piezo beeps =)