Clearly this is due to the 15,4 update. I have not tried to work around it with IRig setup or others. I did try usb direct as well as with usb to 5 pin din in out adapter and with camera adapter. No midi going through the usb c on my IPad Pro 12.9. No luck with any of my Roland keys at all. Juno-Gi 61, Juno-DS 88, and FANTOM 7 (Newest Flagship model Updated to newest version). This is outrageous! So long to Apple being the musicians go to OS. I am hoping for a bug fix but it looks like this has been affecting the musician community since the updates inception on March 31st and there is no solution from apple. Does anybody have a better solution that doesn’t involve purchasing a superfluous midi interface that I shouldn’t need?