All apps should work as I2C leaders, respect tuning tables, etc. This should include MIDI modes, which should now use customize tunings if you have programmed a custom tuning to correct for Ansible DAC offsets, and should allow you to e.g. play Just Friends or W/syn with a MIDI controller, though I have not used this nearly as much as the grid apps.
I apologize that I have not been terribly responsive to a lot of the firmware discussion of late. There are a lot of demands on my time the past few months but I will try to answer questions and address bugs as best I can. I can also convert firmware .hex backups to USB-loadable .json files for anyone who’s unable to update without losing presets due to the USB preset bugs that are (hopefully) fixed going forward.