Tap more to increase power, hold to sustain it at the chosen level. Release to let power decrease again.
You can customize the behavior in three ways: changing the button effect, changing the power mapping, and altering what happens after a press is released.
By changing the button effect you can choose how much a tap boosts the power level, how abruptly the level changes (smoothing), and whether holding down the button sustains the power level or not.
Finally you can also choose how quickly the power level decays towards zero after releasing the button press.