Based on the user guide I'm suppose to be able to loop an Envelope Generator by ether selecting the node I want to use and pressing L or using the drop down menu, however neither ever works and the only time I ever get a looped EG is when I load one with a loop from the EG presets.
 
Also, is there no way to loop a sample?  I'm trying to use the White noise, and if I want it to sound full I need to layer higher pitches of it in, however when I use higher pitches the sample isn't long enough, is there a way to set it to just loop?

It works here. I set a sustain node then pick/create a node to the left of the sustain node for the loop node.
 
When I want a sample to loop, I put a loop in the sample with a wave editor.

Well, look at that, that's what I was missing.  Thanks