modulation

noun

1. 1

   the act of modifying or adjusting according to due measure and proportion (as with regard to artistic effect)

2. 2

   (electronics) the transmission of a signal by using it to vary a carrier wave; changing the carrier's amplitude or frequency or phase

3. 3

   a manner of speaking in which the loudness or pitch or tone of the voice is modified

4. 4

   rise and fall of the voice pitch

5. 5

   a musical passage moving from one key to another