For the record:
I wrote, in a earlier post, that the GMM Grammy Euro 2012 broadcast doesn’t offer English-language commentary.
But it does.
Simply click the button labeled “audio,” near the bottom of the remote*, two or three times to alternate between Thai and English.
Thanks to @tonygjordan for the tip.
(*The remote and AV cables are tucked under a flap in the GMM Grammy satellite box. I missed seeing these items at first.)