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Honestly I don't think there was any technical difference between the linear and AFM HD audio feeds. I worked as a tape jockey at a dup house during the late 80's and everything was recorded using Panasonic 6810's on a common control. The only thing in the audio chain was a limiter/compressor feeding a Y-splitter on the RCA inputs. Consumer grade VHS was all about the profit regardless of the title.
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