Answer: modulating

AnswerCrossword Clue
modulatingVary the strength, tone, or pitch of (one's voice)
modulatingAlter the amplitude or frequency of (an electromagnetic wave or other oscillation) in accordance with the variations of a second signal, typically one of a lower frequency
modulatingExert a modifying or controlling influence on
modulatingMODULATE, to regulate (to control according to rule)
modulatingChange from one key to another
modulatingChange from one form or condition into (another)