before
Brings the first-event process into step with the time between events before an experiment starts.
Done here rather than only in the setters, because a parameter override applied when the experiment is set up replaces the time-between-events process directly, without going through this generator, and it is applied before this runs. A first-event process that was changed from outside the generator, to something other than how it was built or how this generator last set it, has a process of its own, and the link ends.