Mac -

Appreciate your efforts. I rebooted my machine. I did a full factory reset.

Did not change the result. The first gen of the song, once again, there was no sound from the Piano slot which contained an RT (piano). Went to the plugin tab, double clicked the first slot which showed SampleTank. When the plugin form comes up, it shows None in the first slot. Close that and now the sound returns - LOUD. As if it runs through its entire span from 0 - 10 (11 - 127 are unlistenable - loud, then, of course progressively distorted).