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Cary,
You gotta realize that the normal video IF bandpass is extremely wide, and the individual cans are actually stagger-tuned to different frequencies within that band.
Whereas the sound IF is tuned to only *one* single frequency and is extremely narrow compared to the vid IF.
This is why no amount of tweaking the vids is gonna shift their tracking 'toward' the sound.
Whereas shifting the sound IF centerpoint relative to the vid will change tracking.
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