I was wrong. Now that we know the facts, this is a very simple case.
Because the call was interstate (from NJ to Fla), federal law applies. Since federal law allows recording with one-party consent, the recording is legal, and cannot be excluded by a Florida court because it is "the fruit of the poison tree."
It might help to think about it this way: ...
The court doesn't matter
The location of the court that will hear the matter is irrelevant. What matters is the applicable law.
Since the matter was transferred to Florida, I assume that Florida law is applicable.
Was the recording unlawful?
What matters is where the parties were when the recording was made.
If you recorded a person in Florida without ...