(~s, modulating, ~d)
1.
If you ~ your voice or a sound, you change or vary its loudness, pitch, or tone in order to create a particular effect. (WRITTEN)
He carefully ~d his voice.
VERB: V n, also V
2.
To ~ an activity or process means to alter it so that it is more suitable for a particular situation. (FORMAL)
These chemicals ~ the effect of potassium.
VERB: V n
modulation (modulations)
The famine turned the normal modulation of climate into disaster.
N-VAR