Editing Stereophonic sound (section)

===70&nbsp;mm projection===
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Producers often took advantage of the six magnetic soundtracks available for [[70&nbsp;mm film]] release prints, and productions shot in either 65&nbsp;mm or to save money, in 35&nbsp;mm and then blown up to 70&nbsp;mm.  In these instances, the 70&nbsp;mm prints would be mixed for stereo, while the 35&nbsp;mm reduction prints would be remixed for mono.

Some films shot in 35&nbsp;mm, such as ''Camelot'', featured four-track stereophonic sound and were then ''blown up'' to 70&nbsp;mm so that they could be shown on a giant screen with six-track stereophonic sound. Unfortunately however, many of these presentations were only pseudo stereo, utilizing a somewhat artificial six-track panning method. A process known somewhat derogatorily as the ''Columbia Spread'' was often used to synthesize Left Center and Right Center from a combination of Left and Center and Right and Center, respectively, or, for effects, the effect could be "panned" anywhere across the five stage speakers using a one-in/five-out pan pot. Dolby, who did not approve of this practice, which results in loss of separation, instead used the left center and right center channels for LFE (low-frequency enhancement) utilizing the bass units of the otherwise redundant intermediate front speakers, and later the unused HF capacity of these channels to provide for stereo surround in place of the mono surround.