Where do you live? Some states are one party recording states, meaning only one person in the conversation has to know it's being recorded (that would be him). Other states are all party recording states, meaning everyone involved in the conversation needs to be aware of it.
Even if you are in a one party state it would still be up to the judge to decide if he'll listen to it much less enter it in as evidence. I had my x on my answering machine (which the kids had access to) calling me a b!tch and every other name he could think of and the judge in our case didn't care to even hear it.
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