What I'm about to show you is the most basic form of home video editing. It requires no special equipment. One thing to remember when using a system this crude (which, unless you have a lot of money, you're stuck with for a while) is that you can't be very accurate. Don't be frustrated if you try to time a point in the song to a point in your video and it doesn't work. It's not supposed to. Remember, this is a training ground. This is just to get you started. With that in mind, HAVE FUN!
IF USING A SECOND VCR AND ONE SET OF PATCH CORDS: Take one end of your patch cords. Put the first part in the "audio out" section of your playback VCR (if you have a mono VCR, there will only be one "audio out" jack, if you have a stereo VCR, put it in the left [L] jack) and the other part in the "video out" jack. Take the other end. Put the first part in the "audio in" jack of your recording VCR and the other part in the "video in" jack.
IF USING A SECOND VCR AND TWO SETS OF PATCH CORDS: Take one end of your first set of patch cords. Put it in the "audio out" section of your playback VCR. (There will be two jacks if the VCR is stereo. If the VCR is mono, then just forget using two patch cords and see the above instructions)Put the other end in the "audio in" jacks of your recording VCR. Take the other set of patch cords. Put one part of one end in the "video out" jack of your playback VCR and the other end in the "video in" jack of the recording VCR.
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I hope this was able to give you some information on how to become a bonafide A/V nerd