The easiest way to export midi out of FL studio is by going to the menu of the piano roll that you are working on and you click piano roll options> followed by File> Then finally you click “Export as score sheet”Under the rendering of the Score Sheet you’ll have options to Save your File name. I’ve heard of many different programs that facilitate the process such as Finale, Sibelius and Guitar Pro. It is for a competition that I have decided to export this PDF format. I had come to realized how to do this because I needed a composition that let me allocate a PDF for scoring purposes.