I HAVE THINK OF SYNTHESIA IS ALSO A APP THAT CAN MAKE SHEET MUSIC AND CAN MAKE MIDI OUT.
FIRST,IT HAVE THE SYNTHESIA MAINBOARD HERE IN THE TOP
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AND YOU CAN CHOOSE HOW'S SONG LIKE (HARD ROCK[WITH GUITARS],CHARMING TUNES OR...]
There will be something like fl studio,very easy to use and have many extension
AND WHAT'S YOU IDEA