Thanks. I downloaded and installed "ocenaudio" and unfortunately (since today I have done this with three different programs) I can't remember exactly why it didn't work for my purposes--but it didn't. All I remember for sure is that it didn't load or identify the plug-ins. So I uninstalled it.
I went back to the documentation for the plug-ins and noticed a kind of off-hand, generic reference to "Cubase and Nuendo" so I looked up what those are (I knew both names from long, long ago), found their vendor's Web site, and installed a 30-day trial version of Cubase Elements. It sees the plug-ins, so I'll try that for a while, I guess. If it does what I need, the $100 that it costs will be OK.
I'm suppressing a lot of complaining that I could really do about how insanely complicated it was to download and install and get started, all the false "more is more" assumptions built into every aspect of Steinberg's Web site, the application installer, and the application itself (shudder). And I only installed the bare minimum necessary components of the app. But I think I got somewhere. Again, many thanks.
--best regards