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Secondary audio streams can be adjusted by pressing the info button. Within the info menu there will be a section labelled Language. Toggling between the options will change the audio stream. Not all channels have additional audio streams but those that do may include audio in a different language, descriptive video, or sometimes streams with no audio at all.
This did it, Marshall. Thanks. Info showed that the Language had been set to English - Middle. Changed back to English and problem solved. Thanks again.