To specify how Maya interprets incoming take data
Since the .mov file format does not contain information about how data is to be interpreted, the order of data in the take file is important. The order of columns of data in the file must match the order of axes in the device.
If you are creating a virtual device by hand, the order of definition is extremely important and must match your data.
If time stamps were used with the write take, the first column of data is the time-stamp information. The take is applied with the starting time as the starting time of the recording.
If you turn on Use Current Time As Apply Take Start Time under the Controls tab, Maya uses the current time as the start time for the take when you click Preview or Apply Take.