Synthesia Talk

Hi is there a way to "fix" midi files or make them compatible with synthesia e.g I downloaded this midi
https://bitmidi.com/toccata-and-fugue-i ... no-arr-mid


But apparently I need 12 fingers to play it

Most likely you need 10 fingers and 2 feet to play that plus an organ console that includes a pedalboard. Actually you can get away with one foot as organs have a way to play a note plus the octave with one key.