Load a clean 10 Hz log. This page reads from it what the machine was given and how its actuators moved, runs the machine's normal control logic again with the settings you choose, and writes the result as a new log. The colours of the balls, the stroke times and the operator's response times stay those of your log unless you change them here.
A dot marks a setting you changed. "As logged" keeps the timing measured in your log, cycle by cycle. "Serviced" puts the part back to its design timing.
The middle run uses the settings as logged. It should be close to the log itself; how close tells you how far to trust the bottom run. Differences under about 2% are within what a 10 Hz log can resolve. To watch the new log, save it and load it in DataLog replay.