John Dean thinks Trump is the one who recorded Georgia's Raffensperger and released the tape

[Denzil_DC]

2. I believe Dean's only speculating based on voice volume and quality.

The only source I can find about the recording's provenance so far is the New York Times write-up (my bold):

Officials in the secretary of state’s office recorded Saturday’s call, and Mr. Raffensperger told his advisers that he did not want to release a transcript or a recording unless the president attacked state officials or misrepresented what had been discussed, according to a person familiar with his direction.

As expected, that attack came in a tweet on Sunday morning, in which Mr. Trump claimed that Mr. Raffensperger “was unwilling, or unable, to answer questions such as the ‘ballots under table’ scam, ballot destruction, out of state ‘voters’, dead voters, and more. He has no clue!”

In a response on Twitter, Mr. Raffensperger wrote: “Respectfully, President Trump: What you’re saying is not true. The truth will come out.” The recording of the call was made public several hours later.

https://www.nytimes.com/2021/01/03/us/politics/trump-raffensperger-call-georgia.html