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Answer: modulates
Answer	Crossword Clue
MODULATES	Softens.
modulates	Change from one key to another
modulates	Change from one form or condition into (another)

modulates	Exert a modifying or controlling influence on
modulates	Vary the strength, tone, or pitch of (one's voice)
modulates	MODULATE, to regulate (to control according to rule)
modulates	Alter 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

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.

Answer: modulates