Bernardo is basically trying to make Tracy's answer one made without thought, made in the midst of an emotional realization or living of the incident.
Bernardo says even though you knew Tracy was emotional you decided to ask, Is that your some voice in the background?
Tracy's face was looking away from Serino and away from the computer. Bernardo says the vocalization was under his breath, you didn't flat out hear the "no" word unequivocally? I heard it, and saw the movement of his mouth. Do you know if that was a reaction to the audio tape, or to voice ID? Objection, calls for speculation. Sustained.
This had to have been the first time Tracy heard the recording. It was prior to the recording being released to the public.
Bernardo asks if it is normal, when a person is told a loved one is dead, they respond with the word "no."
Redirect. Only after the Lauer call did you asks about voice ID? Yes. What was the purpose of asking Tracy? It was important to the investigation. Objections to leading questions. Tracy's remark became important, but there hadn't been any indication it was anybody but Zimmerman. Serino had heard from Tim Smith, John Good, and knew that when he presented the recording to Tracy. Serino wanted to confirm or cement that. What did you take Tracy's response as an indication of? That the voice was not that of Trayvon. Did he ever ask to listen again? Ever indicate he may have a doubt or change of mind? No. No.
Did Brandy say anything that indicated disagreement with Tracy?