- The following of the path of something that moves. For example, the following of the movements of a scanned object by a radar.
- The following of a changing variable or characteristic, while making corresponding adjustments. For instance, the condition in which simultaneously tuned circuits maintain close resonance for a given tuned frequency.
- A mechanism that adjusts the angle and speed at which a magnetic tape passes the heads, as occurs, for instance, in a VCR.
- A mechanism which adjusts the lateral pressure of a phonograph needle as it follows a groove.
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