Ah Operator. This synth is so deep. Not only is it a fantastic FM synth, but it does subtractive synthesis well too. Also, it really is impressive how the UI manages to fit all those parameters. I mostly use it for cool synth leads. Here's one of my favorite videos on Operator https://youtu.be/rfeY0_k1ctk?si=s68Lr033cHf34a4M by Robert Henke himself.