It took six modulators to make one emitter do this pattern. Haha! Not super practical, but fun!
Modulators 1 and 2 are sawtooth on relative X and Y to make the diagonal motion. Modulators 3 and 4 are step LFOs again on relative X and Y set to make a moving starting point. Modulators 5 and 6 are triangle modulators on the size of modulators 1 and 2 to make the diagonal motion shorter closer to the corners and longer across the middle.
It was a lot of fun tweaking all the numbers to get things as close to perfect as I could!
The canvas is 64 Partials again. Not prettied up very much because the modulation was the point tonight. Haha!