I may need my hand held a bit.
I've been going through one of the old legacy tutorials (making a contrail).
During the middle of section 8 (8.17) the tutorial drives a popnet source
op's Attribute Inherit Velocity parameter by the end result of an fcurve massage by CHOPs via an Export op.
Changes in the UI-and a bit of convolution in the tutorial make this a little confusing in 8.1.
I think the CHOPs is exporting-but establishing the connection to inherit velocity is a little baffleing.
-do i need to explain better?