It is believed the original footage may have been tampered with by Malaysian Authorities or other sources. The recordings, which were published for the first time by the Malaysian government on Thursday, revealed the last contact that air controllers had with flight MH370 before it went missing on March 8.
Almost two months on and the world still calls for answers as investigators still remain baffled by its disappearance. But now audio experts have agreed that the last words heard from the pilots of the flight may have been tampered with in what could be breakthrough for rescuers. Kent Gibson, a forensic audio examiner with Forensic Audio in Los Angeles told NBC News: "You can hear, at 4:07, pages turning or a person breathing, which is unusual.
"It's not unusual that there would be clicks when they push the button on the microphone, but it's very unusual to have a disturbance.
"Normally you wouldn't have any background."
Mr Gibson admitted that the tape could have been recorded by different sources.
He added: "You can assume that the recording while they're still on the ground came from the tower and then you could assume that the communication with air controllers was while they're in the air.
"Unfortunately, there are no smoking guns, except there are edits. And there are clear edits."
He even pointed the finger at Malaysian Authorities editing the footage saying they may have done it, "if the pilot dropped a hint that they didn't want to get out" or "he said something that doesn't fit with the Malaysian government's party line".
But he added: "It's more likely to be an inadvertent thing. But it's not the way to handle evidence."
Other experts say that it sounds like a digital recorder was held up to the speak with background noises heard in the clip. Ed Primeau of Primeau Forensics, who has listened to thousands of hours of footage, said the recording was very strange and parts did not sound like a flight recording.
He said: "At approximately 1:14, the tone of the recording changes, where to me, it sounds like someone is holding a digital recorder up to a speaker, so it's a microphone-to-speaker transfer of that information.
"That's a pretty big deal because it raises the first red flag about there possibly being some editing."
And at two minutes six seconds in, he said: "I can hear a file door being closed, I can hear some papers being shuffled. so I'm further convinced that, beginning at 1:14 continuing through 2:06 to 2:15, it's a digital recorder being held up to a speaker.
"But yet, at 6:17, there's a huge edit because the conversation is cut off. All of a sudden, we go back to the same quality and extremely low noise floor that we had at the beginning of the recording."
Despite the analysis, they seemed to agree that it is still impossible to determine the motives of the crew on board. Over the past eight weeks, searchers from Malaysia, China, Japan, New Zealand, South Korea, Britain , the US and Australia have taken part in the most expensive search in aviation history. Last week, Australian and US authorities confirmed the start of a new search that could take months to complete.
There previous efforts to scale selected areas across the base of the Indian Ocean failed to find any clues. Families of the 239 missing passengers, who were on board the flight from Kuala Lumpur to Beijing, still remain in the Malaysian capital awaiting answers.
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