Bob,
That sounds logical but I can't seem to get it to work. Here's an example:
I started with a new song and selected the ROCKABIL.STY style. This style has 4 instruments. The Strings, Melody and Soloist tracks are blank in the mixer. For the Strings track, I selected a General MIDI patch but nothing appeared in the mixer. I then selected a Hi-Q instrument and its name appeared in the mixer, although the text was white instead of yellow, and there was no sound from this track when I clicked Generate and Play.

Would you be so kind to try this test and tell me what results you got?
Ron