I honestly think the narration is not particularly interesting or important. What is interesting and important is that Armstrong, in these performances, breaks out of the formulas he had gotten into as a matter of touring. They made him a star, but THIS made him an artist.
yes, this has been released in a few formats. And any discography that is dismissive of this, one of Armstrong's great post-War efforts, ought to be tossed in the garbage, after being burned.