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The problem is getting sound and picture editing gear to work together.
I once had a fascinating conversation with an old Ampex engineer. It seems the whole thing was never really necessary. What happened was that NTSC color was rolled out running on a 60 Hz. clock exactly like B&W. At the last minute some people at Ampex who were researching video recording technology noticed bars running through the B&W picture of a color transmission. The FCC went into a panic and quickly figured out that pulling the crystals down .1% got rid of the problem. A few weeks later it was discovered only to be a problem with crystal-controlled lab monitors and not ordinary TV sets.
But it was too late...
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