Carroll Pratt's Human Design Chart

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American sound engineer who, along with laugh track inventor Charley Douglass, pioneered the use of prerecorded laughter. The Pratt brothers (Carroll and John) parted ways with Douglass in 1977, and formed a new company, Sound One. The new company had an immediate edge over Douglass offering stereo recordings that matched the sound quality of stereo programs. Producers were enthused by the ingenuity of Pratt’s laugh track, that by 1978, most producers shifted from Douglass’ track to Pratt’s track for both utilizing and sweetening.
Pratt died of natural causes on 11 November 2010 in Santa Rosa, California at age 89.
Link to Wikipedia biography

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