So you're referring to the tapes that investigators made not the ones Clemens' camp has in their possession? Because from what I understand, they are now saying that they have another tape of McNamee being interviewed by his private investigators. I want to say that McNamee is a moron for not assuming they were taping him but he probably feels scared, cornered and intimidated by Clemens and his people. Plus it doesn't sound like his personal situation is strong at the moment.
I completely agree with this assessment. McNamee's son is apparently critically ill, on top of everything else, and since his son is a big fan of Clemens, McNamee thought maybe Clemens could call him in the hospital to try to cheer him up. That was the purpose of McNamee calling Clemens, as per the text message.
So, Clemens gets his legal team in place, gets the recording studio all set up, and manipulates the call to the extent possible to try to get something out of McNamee that might help him. On that count he failed.