Best used with Programmatic's Score Mod and Timing Bar.
E - Taps
N - Slider Releases
H - Beat Taps
EX - Stacks
XD - Beathold Releases
A good way to practice or adjust your timing on the fly. If you notice your timing is early, decrease your ms. If you notice your timing is late increase it.
Calibration is for nerds, real ones use 1000 ms offset