Rodrigo I have just listened to the first midi to my pc and it had several different melodies which are probably the demo song of the Korg model.
It will take you ages to make them sound close to something nice.
Tooooooo many voices to change and then apply the effects!
You got to listen to the original and correct eveything by ear.
There is no program that can do that for you.
Programs don't have ears and even if they had they wouldn't have taste in music.