i tried creating multiple particle emitters, each with its own birth rate, using the copy/stamp/param system. after a few hours of trying every variation i could think of, using $CY or $PT as the stamp value or an expression based on those, i haven’t been able to get the particle SOP’s birth field to recognize any stamped values. 
-steve
Hey,
Yes I am not surprised the particle SOP isnt stampable. It has to cook each frame and retain data from the last frame to cook the next frame. I am sure there are more cases where stamping breaks down.
However this isnt stopping you from creating a stamped emitter and feeding that into a single particular SOP. It would definitely perform better than stamping a seperate particle system onto a template since it would essentially be running a whole new particle system per template point.
Ive attached a component that uses stamping to create an emitter.
J
stamped_emitter.tox (3.29 KB)