Thank you for your kindness OrionRising.
Incidentally, while I still haven't found the cause of having suddenly lost the sound that was working, I did find one solution that may also work for you.
I installed the KDE half of Gutsy along side of my existing Gnome. I have sound again, though I can't begin to explain why.
Finally, while the sound problem has been resolved, the disc burning issue (which began at the same time) is still present.
Question: How in the heck does something suddenly UNwork??