If your testimony is important to the trial, you'll be asked to deliver it again in person, or in a deposition; either way you will have an opportunity to prep with your counsel.
In theory, a recording could be detrimental to you, as either the prosecution or defense would have a chance to play up tiny inconsistencies between your first recording and your live testimony/deposition. Without the recording, the best they can do is have the agent testify "that's not what he/she said the first time." Which doesn't really matter.
If you get prosecuted for lying to the agent, again, you would have a chance to testify at trial, and for your counsel to try to impeach the agent in front of the jury.
Lol, your word against a federal agent's. How well did that work out for Martha Stewart and her literal army of top end lawyers?