In a message dated 2/8/2005 1:29:55 P.M. Eastern Standard Time, chizotz@xxxxxxxxx writes: Magnetic tape has (this is basic so don't hold me to specifics) a stripe down one edge that contains timing ticks, and the rest of the tape width is used to store the actual analog data, usually sound information. Stereo recorders broke that area down into two stripes, one for each channel. I've never heard of these timing ticks and I've been dealing with recording tape for a good 35 to 40 years now. And, I don't recall video tape having them either. I've been dealing with that stuff for at least 33 years now, back when it was still only available on open reels. The video record head spins around at a very fast pace and records the picture onto the tape at an angle like this: \\\\\\\\\\\\\\\\\\\\ Each of those lines is equivalent to one pass of the video head. There are actually two heads on the cylinder that spins around. Each of those lines is probably also equal to one frame, but I'm not absolutely sure about that. As far as I know, the modern video tape machine doesn't use ticks at all, it just very quickly adjusts itself to the correct speed that the tape was recorded at. That's why the machine has to spend a few seconds tracking when you first pop a tape into it. It spends about 1 second adjusting to the correct speed and the next few fine tuning to that speed so that the playback will match up with the record. Record a video tape at one speed for a few minutes, or even a few seconds, and then stop tape and set it to record at a different speed. When you play the tape back from the start, when it get's to the point where you switched speeds, you'll hear the sound speed up or slow down dramatically within about half a second. That's because the machine is adjusting itself to the correct speed. It's also going to have to track again to adjust to the new playback speed of the tape. With audio tape the speed is adjusted by the person operating the machine. What good are ticks when you can fine tune the speed (the pitch) while you play or record the tape? Dale For a web-based membership management utility and information on list policies, please see http://nibec.com/24hoursupport/ To unsubscribe, send a blank email to 24hoursupport-request@xxxxxxxxxxxxx with "unsubscribe" (without quotes) in the subject.