The soft can convert midi to wave , How to convert midi to wave ? Can you add the function ?
This is a similar problem as image recognition: VERY HARD without extra information (and even then..).
when composing sound-samples with different voices (and instruments), the overlap of voices is very difficult to split open again.
There does exist commercial software that promises this functionality, but the result is far unsatisfying.
The best method is to contact a musician/composer to ask to write your score :D... The trained human ear-brain combination is still unmachable.