Melodyne Editor is very likely the program to try first.

I have editor (ME) but when I tried to edit a poly piano track it did better at removing notes than trying to change notes. I never tried to get it to convert audio to midi.

It nailed the poly notes in the chords so I would think it should be a breeze to make them midi notes and them apply a synth of your choice to the resultant midi track.

Perhaps I will play around and experiment with this since I have never done it.


You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.