Well, by the nature of asymptotes, it’s never perfectly satisfying but is as close to perfectly satisfying as you want if you do it long enough.
Having a Mutable Instruments Module Tester makes VCO calibration an order of magnitude less tedious. It has a mode where it tells you the interval (in cents) between the two most recent pitches it’s seen, all you have to do is play (say) double octaves and adjust the trimmer until that interval is 2400. It’s also hugely useful in doing all sorts of other module testing and troubleshooting. Not a terribly cheap build, the DC to DC converter alone is an $11 part, but very worth it.