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It still needs power for the pilot lamp and the video path and any processing. All are electronic. This is a mechanical switch trying to live in an electronically synchronized world. A live change from one source to another DURING a recording will upset sync as the video may change mid-scan and not lock right away to the new sync unlike a modern switcher that waits to the end of the frame/sync to do the switch. If you use it only for a one-pass recording, you should be fine. Think of this as more like a router than a switcher.
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“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes.
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