Wish it had actual midi out to control sound module or arranger. They stopped after P95/35.

USB out alone limits overall use.

Same issue with Roland FP 10/30 ( $499/$699) love the key response, 4 good pianos but limited / so so EPs, though organs and strings are great. It also comes with similar app). USB to device also ( I believe it can play back SMF, not sure,need to confirm it).

But you have YAMMY P515 with both USB and midi out, better keys but, it’s heavy.