If a Changeling alters it’s form, does its voice also change?

@jaa0109 @JeremyECrawfordIf a Changeling alters it’s form, does its voice also change? Or physical appearance only?
voice too

— Mike Mearls (@mikemearls) September 3, 2015

@gaaran00bcan a Changeling use this to mimic people’s voices? only voice of current form

— Mike Mearls (@mikemearls) September 25, 2015