modulate

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modu|late /m'ɒdʒʊleɪt/ (modulates modulating modulated)
1 [VERB] V n, also V
If you modulate your voice or a sound, you change or vary its loudness, pitch, or tone in order to create a particular effect. (WRITTEN)
He carefully modulated his voice.
2 [VERB] V n
To modulate an activity or process means to alter it so that it is more suitable for a particular situation. (FORMAL)
These chemicals modulate the effect of potassium.
● modulation [N-VAR]
The famine turned the normal modulation of climate into disaster.

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