As this post of mine developed and several members spent their valuable time attempting to help me, I had a secret dread that the solution might be something so simple that I would be made to feel STOOPID! Well it was. And I do. The setting of my Creative Media Player/Time Scale was set to play slow. I had not touched this setting so I do not know how this happened. But that was the cause and it was the one, basic thing that I had not thought to check. Perhaps, at least, my admission of this omission might prove salutary to the mental health of the next novice with a similar problem. And thanks again to those who tried to help.