To Quote a great old song: I'm beginning to see the light.
First,I wasted time changing the cable. It made no difference.
Second, I now know that what I was trying to do won't work. Why not? Because the MIDI Output Driver Wizard allows sound from either the soundcard or from the module but not both. Thanks, Mac.
I don't thoroughly understand, but my testing proves something. When I select the soundcard, my keyboard plays the BIAB sounds; when I choose the module in the Wizard I control the module's patches. Mac hit the nail on the head and Noel' guidance led the way.
Something I have to get my brain around, though: Why is it that I can set up a daisy chain of keyboards and hear the selected sounds of each, but can't with software like BIAB?
Ok, Onward to sequencing study with Power Tracks.
Thanks to all out there for your helpful contributions.