what am i missing when trying to copy and paste an envelope to a new automation lane?

in X2 (probably in other versions) you can more or less copy automation to a different parameter, though it takes some fiddling.  A basic problem, though, is that the scaling of different parameters is different - so that, for example, copying Volume automation to the input gain of a plugin will probably not result in the same volume changes, since the input gain of the plugin likely not only has different low and high points, but could have different rates of change over different regions to allow greater precision in some places.
 
to copy it, you have to right-click on the envelope you want to copy from, and assign it to the new parameter, then paste the original envelope back to the original parameter.  I'm not sure if you can paste into an existing parameter.