Well, I just hooked my DTC-100 back up, for a test, and there is no problem with the audio. Then I swapped back to the TO-DST51A, and no audio again. I cycled the power, but it did not change anything...other than the fact that the TU-DST51A did not return to the power-on mode -- I had to turn it back on.
Are there any other TU-DST51A users here in the Houston area? Can you guys hear audio on Fox 27, or is it peculiar to my box? I'm hearing audio from all of the other local OTA channels.