Until recently, manufacturers of amateur video equipment felt there was no need to put this capability in their equipment. Top-end camcorders are now beginning to feature timecode and the better edit controllers can use it to make productions extremely accurate. Timecode is much more common in European and Japanese models, apparently because the manufacturers feel foreign video consumers are more sophisticated. Sometimes, you may want to further modify the resulting tape, recording it once more. Each time you copy a tape, some quality is lost.
Enhancers can, in some cases, reduce the loss slightly, but it is best to keep copying to a minimum.
The best editing equipment produces second-generation results. Once you have made the perfect final production, you may want to make another for someone else. The obvious way to do this is to copy the final production but the resulting copy will be of poorer quality than the original because it will be at best a copy of a copy. The second tape is exactly the same as the first, meaning that the tape you send to Grandma is just as good as the one you keep for yourself. The customer will invariably decide to give the second copy to someone or find another use for it, and you have increased your sale.