Regarding the audio on ZooTV Sydney, from www.u2wanderer.org:
This concert video is 118 minutes in length, and marked the first time U2 had released a full show on video since 1983's Under a Blood Red Sky. The video was filmed in Sydney Australia on the fall leg of 1993's Zoo TV tour. They had filmed two nights in Sydney, one a warm up night, became problematic when Adam Clayton did not show up to perform. Instead his tech, Stuart Morgan played bass that night.(Of course, we all know why TTTYAATW was cut - the girl pulled onstage to swig champagne with yer man was a minor. Oops!)
The second night was filmed again, this time with Adam Clayton performing, and it was an amazing concert. One song performed that night is not included in the video release. "Tryin' to Throw Your Arms Around the World" did not make the video for some reason. There are other changes evident when one listens to a concert bootleg of this show, including a shortened speech by Bono in the official concert release.
I've been trying to find film of the full speech for ages - the text of it is in U2ATEOTW, but I haven't been able to find a video!