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The TBC is a timebase corrector, although it does switch video internally, it's not a multi-input production switcher. Look at it as an extension of your deck, that corrects dropouts (sometimes) and helps get frames marching around the facility in sync with other equipment. You'll want it in-line almost always, even when viewing or dubbing, as it makes things look better and gives you signal adjustment as well.
So "TBC switcher" and "TBC commander" might need a different term to describe it.
A Sony RM440 is a video edit controller. It controls tape machines in relation to each other, allowing more convenient transport control and edit point entry than doing it on the tape machine's front panel -- if the machine will even support front-panel controlled editing. (5850, only manually "punch and pray". BVU-series, yes.) The RM440 doesn't have any video inputs or outputs -- that's all at the deck. (It has a reference signal input that comes in on a video connector.)
Chip
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