Since my previous post, I realized that I do have track tags, and they do work in ARC B103, if I select the right tag.
However, the problem is that if you go to Library > Tracks and hit the Tag button, it lists all tags, including those that are never used on tracks. I have several tens of tags, but just a few that I use on tracks. So finding ones that work for tracks is difficult.
Hitting an album tag does not list all tracks that are part of the tagged albums. (which I guess makes sense)