[1] More recently, they are found on handheld PDAs, and as the scroll wheel on computer mice.
Once the dial stops moving, the media continues playing or remains paused at that point.
Once the wheel is released, it springs back to the middle position and the media pauses or begins playing again.
If the device is set or designed to pause after the wheel is used, the audio is often stuttered, repeating a small section over and over again.
This is usually done on DJ CD players, for the purpose of beatmatching, and is equivalent to an earlier turntablist DJ moving a phonograph record back and forth slightly to find the physical location of a starting beat within the groove.