Four Tet used FM. It's a UK thing and I absolutely love it haha. It's super easy to do. Just adjust open up operator. Use A as the sub, B into it with the coarse up level up and set the decay short. After for the counter melody just put the coarse further up.. Bob's your uncle, Fanny's your aunt. Also, I made an hour long video on FM for Abletunes you can find here: https://www.youtube.com/watch?v=ny3sftUJJTA