Have a listen and Splice the tutorial files if you like it. Available at https://splice.com/h-bar/more-hoopla-for-your-mooplah-mr-muffin-man. Then have a look at the tutorial. Here is a tutorial on how to chain midi FX to create a jazz ensemble from one note in Logic Pro X.
Really pleased to open source GFF. It just makes sense that a project that is about giving to charity for free should itself be free. The new home of GFF is https://github.com/flashquartermaster/Give-For-Free. Enjoy!