Question: When was the American audio engineer and clandestine chemist died who recorded the album Live at the Carousel Ballroom 1968?

Context articles: Grateful Dead Download Series Volume 6
Live at the Carousel Ballroom 1968
Stephen Desper
Bruce Jackson (audio engineer)
Audio engineer
Owsley Stanley
Road Trips Volume 2 Number 2
Yurii Barybin
James Bullough Lansing
Michael Graves (audio engineer)

Volume 6 is the sixth in a series of live digital downloads of the band the Grateful Dead released by The Grateful Dead Productions.
 It was released on October 4, 2005 and is a single disc featuring some of the band performing on March 17, 1968 at the Carousel Ballroom (which later became the Fillmore West) in San Francisco, CA.
 The show features the first set closer "Turn On Your Lovelight" and the whole second set.
Live at the Carousel Ballroom 1968 is a live album by Big Brother and the Holding Company featuring Janis Joplin.
 The album was recorded by Owsley Stanley in 1968, and released on March 12, 2012, on the one-year anniversary of his death in an automobile accident.
 He had previously been supervising the development and release of this album right up to the time of his death on March 12, 2011.
 The album is dedicated to him, and set to the specifications Stanley set prior to his death.
Stephen W. Desper is an American audio engineer and record producer.
 He is best known for his work with the Beach Boys during the early 1970s and for inventing the Spatializer.
 The Spatializer is an audio effect which employs psychoacoustic techniques that emulate three-dimensional ambience via traditional stereophonic units, and can be heard in the Bonnie Raitt album "Longing in Their Hearts" (1994).
Bruce Robert Jackson (3 June 1949 – 29 January 2011) was an Australian audio engineer who co-founded JANDS, an Australian audio, lighting and staging company.
 He joined American touring audio engineer Roy Clair and mixed concert stage monitors for Elvis Presley in the 1970s.
 With Clair Brothers, a concert sound company, Jackson designed audio electronics including a custom mixing console.
 Beginning in 1978, Jackson toured as Bruce Springsteen's band engineer for a decade, using Clair Brothers sound systems.
 A business interest in Fairlight CMI in Sydney introduced Jackson to digital audio, and he subsequently founded the digital audio company Apogee Electronics in Santa Monica, California, where he lived at the time.
 After selling his share of Apogee, Jackson co-founded with Roy and Gene Clair a joint venture which produced the Clair iO, a loudspeaker management system for control of complex concert sound systems.
 Jackson turned the venture commercial with the help of Dave McGrath's Lake Technology.
 Dolby Laboratories bought the technology and formed Dolby Lake with Jackson as vice president, then in 2009 Lab.gruppen acquired the brand.
 Jackson was honoured with the Parnelli Innovator Award in 2005 for his inventive loudspeaker controller.
An audio engineer (also sometimes recording engineer or a vocal engineer) works on the recording, manipulating the record using equalization and electronic effects, mixing, reproduction, and reinforcement of sound.
 Audio engineers work on the "...technical aspect of recording—the placing of microphones, pre-amp knobs, the setting of levels.
 The physical recording of any project is done by an engineer ... the nuts and bolts."
 Many audio engineers creatively use technologies to produce sound for film, radio, television, music, and video games.
 Audio engineers also set up, sound check and do live sound mixing using an audio console and a sound reinforcement system for music concerts, theatre, sports games and corporate events.
Owsley Stanley (born Augustus Owsley Stanley III, January 19, 1935 – March 12, 2011) was an American audio engineer and clandestine chemist.
 He was a key figure in the San Francisco Bay Area hippie movement during the 1960s and played a pivotal role in the counterculture of the 1960s.
 Under the professional name Bear, he was the soundman for the rock band the Grateful Dead, whom he met when Ken Kesey invited them to an Acid Test party.
 As their sound engineer, Stanley frequently recorded live tapes behind his mixing board, designed their trademark skull logo, and developed their Wall of Sound sound system, one of the largest mobile public address systems ever constructed.
Road Trips Volume 2 Number 2 is two-CD live album by the American rock band the Grateful Dead.
 The sixth in their "Road Trips" series of albums, it was the first to contain a complete concert — the February 14, 1968 show at the Carousel Ballroom (later known as the Fillmore West) in San Francisco, California.
 Bonus material on Disc 1, as well as the bonus disc offered to early purchasers, comes from the Grateful Dead and Quicksilver Messenger Service "Tour of the Great Pacific Northwest", immediately precededing the Carousel Ballroom show.
 The album was released on March 21, 2009.
Yurii Barybin (born in Kherson , Ukraine) is a sound producer and mixing engineer, production manager, technical director, live sound engineer (FOH and monitor), audio systems engineer, personal in-ear monitor systems designer, recording and mastering engineer, author of the patented Diversity Source Monitor Audio Mixing Technique.
 Full member of Audio Engineer Society (AES) and member of Ukrainian Union of Audio Engineers.
James Bullough Lansing (born James Martini, January 14, 1902 – September 24, 1949) was a pioneering American audio engineer and loudspeaker designer who was most notable for establishing two audio companies that bear his name, Altec Lansing and JBL, the latter taken from his initials.
Michael Graves is an American audio engineer.
 He specializes in audio mastering, audio preservation, audio restoration and forensic audio restoration.