@scook - yeah, I tried that first, but it didn't come up. I later went back, and figured out why help didn't pop up when I hit F1.
I had clicked on the Title Bar (the top of the UI window), and had not clicked INSIDE the window itself - and after I went back in and clicked somewhere within the UI window, rather than at the top in the title bar, help promptly showed up.
I am a little disappointed that nobody can seem to find the online help for these included effects without actually loading an instance of the effect. The documentation section on all of the included effects clearly indicates that one can look for online help for each effect, but a search of the index returns ZERO results for it.
I would much rather read up on the use and control of an effect PRIOR to loading it into the project and hitting F1 from within the effect's UI, and I would have thought this information would have been available in the main documentation somewhere.
In any case - YES by all means use the F1 key within the UI window to read up on controlling the TL-64 Tube Leveler, and any other effect you are interested in.
Bob Bone