The sources indicate that the only recorded conversation in which Trump engaged in a substantive conversations was the tape that aired on CNN Tuesday night.
That may very well be the case. The tape in question was downplayed by Giuliani, since he says the payment never occurred and the recording shows no admission of guilt. That may not be so. In the conversation, the discussion centers around acquiring information from "our friend David," so they have the control over it. They allude to the fact something could happen to David and have concerns over what that means for the information afterward.
This possibly indicates a exclusive deal with a known friend of Trump. If that is the case, it gives some legitimacy to the argument the Enquirer deal was political cover for Trump and causes campaign finance headaches. Pecker, Cohen, and Trump are the three that would know for sure. Only one of them is facing potential charges from SDNY.