Modulation of the voice (7)
I believe the answer is:
cadence
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">modulation of the voice</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for cadence that I've seen before include "Final musical sequence" , "Inflection; voice pitch fall" , "Vocal modulation or inflection" , "Lilt" , "that may be perfect for musicians" .)