Reply #1: The obvious explanation

[AlienSpaceBat]

Is that the alleged CVR recording doesn't come from the recorder on flight 93. It has been a work-in-progress that has changed over time. It was faked once, then they want a different emphasis so they produce version two. As no-one has got either version to compare, all that we can say is 'this is inconsistent with what was previously reported', rather than holding both versions up in public and saying 'one or both of these MUST be a lie'.

We get caught out by the same problem that afflicts so many aspects of the search for the truth of 9/11. The amount of evidence we have is tiny compared with what exists (or existed), so the best that can be done is to compare fragments, usually secondhand as in this case.

Its so frustrating, but the withholding and destruction of primary sources makes it so difficult to assemble an authoritative account of what happened in so many instances. This has been the real masterstroke of those that have so much to hide - they set the memes running of the official story in the hours following the events, and the scraps of evidence in the public domain never add up to the incontrovertible in-your-face smoking gun that the majority populace seems to need.