You GOGO MabatYes, it turns out it's not so straightforward to design a perfect conical horn for a spherical source. It still requires some experimentation. I've been quite busy lately so I can't pursue this further myself. In the meantime, I at least implemented variables into the script "language" so I'll be able to perform some pretty complex optimizations, including the ESP parameters. There's still a lot to be achieved, I think.