Thank you Noel. I succeeded in copying the song into the melody track. Played notes still not tuning red on lead sheet view. But the played note does turn red in notation view.

It is strange because for some of the bars, in some songs, the played note DOES turn red in lead sheet or fake book view.

Is it some random computer glitch, or something to do with the particular accompaniment? The square boxes in the menu bar with a G, P, etc, are presumably to allow you to select which part's music you want displayed. But there is no M or S box for melody or soloist.