So far, I made some explorations with Vertex colors, but they don’t get blended like the clones. So, no go so far.
Looping in the Formula Effector is based on the formula.
In you set up it is
sin(((id / count) + t/4) * f * 360.0)
So, given 360 and f=1, then time is divided by four, which means: after four seconds, it matches the starting point. If you change anything in the formula, it will change that outcome, I’m sure you said in your head, “I know that…”, but since I write in a forum, I have to go a little bit broader.
So, if that would be the only influence, it would be easy.
In the Cloner, the Rate is set to 8%. 100/8 = 12.5 will give you the seconds until it loops with this value. So after 100 frames ([sic]), it will match the starting point. With 8.33333’%, it will match after 8 seconds.
Edit, 0-119 frames while the project was set up with 30 fps. /edit
All the best