To the person who wrote that they did not understand my question ...

It was simply that the manual says, for OPEN & SELECT mode:
"Opens the Voice selector with the top (first) voice of the voice category automatically selected"

when in fact in this mode it opens the Voice selector with whichever voice you'd last used automatically selected.

I guess it's just that the manual doesn't really tell the full real story as to what happens in OPEN & SELECT mode. . .

Jim