Just listen to the tape.
Those who want to hear a voice will hear a voice.
Those who want it to be Burke's voice will hear Burke's voice.
And those who want to hear an incriminating statement, will indeed hear an incriminating statement.

The fact that such artifacts are common on re-used, bulk erased tapes is meaningless to those who truly hear what they want to hear.

I'm sure if the tape ever is released publicly there will be all sorts of conversations that are "heard" on it.