Hi, Rick-
Well, since I'm located just outside of Cape Town these days, my postings were actually part of a normal day-- I unfortunately can't take credit for working diligently into the wee hours of the morning.
And now, in the clear light of the afternoon here, I see now what was meant by `upper left of the GUI'.... He meant the `upper left of the GUI'. And that (using the Index button) fixes my problem great (the underlay does just have a single volume).
Thanks to you both.
--pt