The New Kind of Flesh: "The moment has tuned up"

Following that introductory scene of the Assistant (whether a Richard Prince nurse or Renfield) alerting the Doctor to the moon coming out, this line alludes to a kind of musical overture just as it completes: not the moment which is in the process of tuning up, but the one, the Moment, that has tuned up in preparation for what follows.  How does any moment "tune up"?  It's time itself doing whatever musicians do to prepare for the point at which the composition per se begins,  The moment is ready to be a moment rather than something else, or some out-of-tune version of itself.  It's the "right" in "when the time is right," but that's right not as in correct but right as in righteous, or rightly, somehow qualified from any absolute logical rectitude -- that's indeed why tuning up is necessary in the first place.