Audio experts testify in Zimmerman trial, again

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Sybrina Fulton, left, mother of slain teen Trayvon Martin, talks with State Attorney Angela Corey during the George Zimmerman trial in Seminole circuit court in Sanford, Fla., Monday, June 17, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.(AP Photo/Orlando Sentinel, Joe Burbank, Pool)

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Audio experts te... Sybrina Fulton, left, mother of slain teen Trayvon Martin, talks with State Attorney Angela Corey during the George Zimmerman trial in Seminole circuit court in Sanford, Fla., Monday, June 17, 2013. Zimmerman has been charged with second-degree murder for the 2012 shooting death of Trayvon Martin.(AP Photo/Orlando Sentinel, Joe Burbank, Pool)
Va. site of Poca... This June 26, 2003 photo provided by the Werowocomoco Research Group, shows the Werowocomoco site trench features under excavation by William & Mary students in Gloucester, Va. The farm field overlooking the York River is believed to where Pocahontas interceded with her powerful father Powhatan to rescue Capt. John Smith from death, a fanciful footnote in the history books for many Virginia Indians and historians. (AP Photo/Werowocomoco Research Group)
Transgender cand... City council candidate Mel Wymore, center, talks with Leah Gunn Barrett, right, New Yorkers Against Gun Violence (NYAGV) executive director, following a gun law rally on Friday, June 14, 2013 on the steps of New York City Hall. If Wymore wins a council seat it would mark the first transgender officeholder for the city. (AP Photo/Bebeto Matthews)
Reputed Mafioso ... Investigators look over the scene in Oakland Township, Mich., Monday, June 17, 2013, where officials search for the remains of Teamsters union president Jimmy Hoffa who disappeared from a Detroit-area restaurant in 1975. (AP Photo/Carlos Osorio)
Witness: Man who... Peter Jones, of Washington, D.C., an airline passenger arriving from Hong Kong answers a question in the international arrivals area at Newark Liberty Airport, Monday, June 17, 2013, in Newark, N.J. , about a fellow passenger who claimed everyone on the flight was poisoned. The plane landed safely at Newark Liberty Airport, and the man was taken off the plane under a heavy police presence. The man stood up during the flight to make the claim but there was no indication that any passengers aboard United Airlines Flight 116 were actually poisoned, an FBI spokesman said. (AP Photo/Mel Evans)
Texas governor w... Texas Gov. Rick Perry speaks to the media before hosting a lunch appointment with Connecticut gun makers in Hartford, Conn., Monday, June 17, 2013. The governors of Texas and South Dakota are visiting Connecticut to court local gun makers, many of which have threatened to leave since the state passed tough new gun-control laws in response to the massacre at Sandy Hook Elementary School. (AP Photo/Jessica Hill)
Ex-hitman: I was... FILE - This June 23, 2011 booking photo provided by the U.S. Marshals Service shows James "Whitey" Bulger, one of the FBI's Ten Most Wanted fugitives, captured in Santa Monica, Calif., after 16 years on the run. Opening arguments in Bulger's trial begin Wednesday, June 12, 2013 in federal court in Boston. (AP Photo/ U.S. Marshals Service, File)
Still no Hoffa a... Investigators look over the scene in Oakland Township, Mich., Monday, June 17, 2013, where officials search for the remains of Teamsters union president Jimmy Hoffa who disappeared from a Detroit-area restaurant in 1975. (AP Photo/Carlos Osorio)
Investigators 'z... Firefighter Brandie Smith from Salida, Colo., walks past a burned out structure on the Black Forest wildfire north of Colorado Springs, Colo., on Monday, June 17, 2013. Over 470 homes burned in the wildfire that started last Tuesday. (AP Photo/Ed Andrieski)
Remote Mich. vil... In this photo made June 16, 2013, and provided by Great Lakes Exploation Group, diver Jim Nowka of Great Lakes Exploration Group inspects a wooden beam extending from the floor of Lake Michigan that experts believe may be part of the Griffin, a ship that sank in 1679. Crews are digging a pit at the base of the beam to see if it's attached to a buried ship. (AP Photo/David J. Ruck, Great Lakes Exploration Group)
Chaos as gunfire... Police are outside St. James Catholic Church in Ogden, Utah, Sunday June 16, 2013 after a man was shot in the back of the head during mass at the church. The suspect, Charles Richard Jennings Jr., 35, was captured Sunday afternoon in nearby Box Elder County after fleeing in a stolen pickup truck, investigators said. (AP Photo/Standard-Examiner, Benjamin Zack) TV OUT; MANDATORY CREDIT MBO (BENJAMIN ZACK/Standard-Examiner) MANDATORY CREDIT, LOCAL TV OUT
NASA picks 8 new... This photo provided by NASA shows Nicole Aunapu Mann. NASA has eight new astronauts _ its first new batch in four years. Mann is one of the candidates. Mann, 35, Major, U.S. Marine Corps, originally is from Penngrove, Calif. She is a graduate of the U.S. Naval Academy, Stanford (Calif.) University and the U.S. Naval Test Pilot School, Patuxent River, Md. Mann is an F/A 18 pilot, currently serving as an Integrated Product Team Lead at the U.S. Naval Air Station, Patuxent River. (AP Photo/NASA)
Komen breast can... In this undated photo provided by Susan G. Komen for the Cure, new President and CEO Judith A. Salerno, left, is shown with Komen Founder and now Chair of Global Strategy Nancy G. Brinker. The breast cancer charity on Monday, June 17, 2013, announced that it named Salerno as its new leader. Salerno replaces Brinker, the charity's founder, who announced last summer she would step down, following an onslaught of criticism over Komen's decision to stop funding Planned Parenthood. (AP Photo/Susan G. Koman for the Cure)
Court: Ariz. cit... U.S. History students from Austin, Minn. High School visit the Supreme Court in Washington, Monday, June 17, 2013, in anticipation of key decisions being announced. With a week remaining in the current Supreme Court term, several major cases are still outstanding that could have widespread political impact on same-sex marriage, voting rights, and affirmative action. (AP Photo/J. Scott Applewhite)
Official: Solar ... Andre Borschberg, one of two pilots of the Solar Impulse plane is interviewed by a reporter on a ladder as he sits inside the cockpit of the solar powered plane during a media availability at the Smithsonian National Air and Space Museum’s Steven F. Udvar-Hazy Center at Washington Dulles International Airport in Chantilly, Va., Monday, June 17, 2013. (AP Photo/Jacquelyn Martin)
Putin: US-Russia... President Barack Obama meets with Russian President Vladimir Putin in Enniskillen, Northern Ireland, Monday, June 17, 2013. Obama and Putin discussed the ongoing conflict in Syria during their bilateral meeting. (AP Photo/Evan Vucci)
Immigration spli... FILE - In this May 17, 2013 file photo, Rep. Kenny Marchant, R-Texas speaks on Capitol Hill in Washington. The Republican establishment hopes an overhaul of immigration laws will help the party run stronger presidential races. But that goal is about to hit big hurdles in the form of House Republicans. Many House Republicans are hostile to the bipartisan immigration bill before the Senate. Even substantial changes to it may do little to placate those who demand strict crackdowns on unlawful border crossings and no “amnesty” for people here illegally. (AP Photo/Charles Dharapak, File)
Food companies w... In this undated photo provided by Kraft Foods Inc., a package of Oscar Mayer Carving Board Turkey Breast is shown. More companies are now trying to make processed foods appear more homespun. (AP Photo/Kraft Foods Inc.)
Guardian: Snowde... FILE - This June 9, 2013 photo provided by The Guardian newspaper in London shows Edward Snowden, who worked as a contract employee at the U.S. National Security Agency, in Hong Kong. The Guardian newspaper says that the British eavesdropping agency GCHQ repeatedly hacked into foreign diplomats' phones and emails when the U.K. hosted international conferences, even going so far as to set up a bugged Internet café in an effort to get an edge in high-stakes negotiations. The Guardian cites more than half a dozen internal government documents provided by former NSA contractor Edward Snowden as the basis for its reporting on GCHQ's intelligence operations. (AP Photo/The Guardian, File)
For young immigr... In this Wednesday, June 12, 2013 photo, brothers Jorge Tume, left, and Francis Tume are shown in Miami. Tume’s parents brought them to the U.S. from Peru on tourist visas when they were young and decided to stay, becoming unauthorized immigrants with no legal status. Now, one year after President Barack Obama announced an executive order allowing young people living in the U.S. illegally to stay and work, nearly 300,000 young adults previously living illegally in the United States have been granted permission to stay and work through the program, the most significant shift in immigration policy in recent decades. (AP Photo/Wilfredo Lee)
Indiana woman co... In this May 29, 1985, photo provided by the Lake County, Ind., Police Department is Paula Cooper who was sentenced to death when she was 15 after stabbing a 78-year-old Bible school teacher 33 times during a 1985 robbery in Gary, Ind. A Department of Correction spokesman says Cooper, now 43, was released from an Indiana prison Monday, June 17, 2013. A state court overturned her death sentence in 1988. (AP Photo/Lake County Police Depatmrnt via The Indianapolis Star)
A guide to the t... This courtroom sketch depicts James "Whitey" Bulger during the first day of his racketeering trial in U.S. District Court in Boston, Wednesday, June 12, 2013. At right is defense attorney J.W. Carney, Jr. Bulger faces a long list of crimes, including extortion and playing a role in 19 killings. (AP Photo/Margaret Small)