Further update: Sound is available after all. The proper switch to use is "External Amplifier." Anyone else out there doing the same thing I am, /make sure you select the External Amplifier switch and turn it on/. Only then will you get sound. The test sound will then play flawlessly.
The "smart" update is now complete. That didn't take long--half an hour, forty-five minutes tops. The Inspiron 1200 has a fast processor, and I'm on a Cable network.
Next on the list:
Screensaver
Additional "smart" channels
MADWifi
Temlakos