Thank you for your prompt and helpful reply.

I did as you said and can see the 522 and regenerated, but did hear anything. The 522 was also listed on the RealTracks list.

But ... this is the annoying thing. When I first loaded this song all the tracks were frozen and I could only hear the drums. When I unfroze the tracks and regenerated I could hear all the tracks except the 522.

After your reply I loaded the song again, still in the frozen state. I unfroze each track, one at a time and I could hear the re-generated tracks of those that had been unfrozen, but not the 522. It was only when I finally unfroze the last track (Bass) and re-generated that I could now hear the 522. But also, previously I had simply unfrozen the tracks and regenerated and still didn't hear the 522.

So I'm not sure if there is something going on with regard to the unfreezing of the tracks.

I'm just relieved that it is operating the way I thought it was meant to.

Thank you