What gets calibrated?

Does another person or singingstyle require a re-calibration or is it just the microphone itself that gets calibrated?

Calibration is focused on input gain and the microphone. You shouldn’t need to recalibrate with another person using the same mic input, unless they are singing with drastically different volume. Different styles shouldn’t impact calibration, and you can adjust input level and stickiness in the play tab if you need