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The timbre is changed: the cause is the great speed of sound in helium. Every material has a different speed of sound.
voicebox
Amplitude
A bigger persons voice is bigger than a smaller persons voice because a bigger person chest is bigger while the smallers person chest is smaller.
All of them have changed except Eggman's voice actor.
he's voice changed when started singing the really high notes or his voice changed like every boys voice changes when they get older.
sick
the vibrations throughout the voice of the waves will reach through your hands and you will be able to feel the vibrations of the persons and you will feel the vibrations of the persons voice
It amplifies a persons voice.
nant
Sing or do whatever you have a great voice at in a school talent show or something. Cos Justin Sucks ... Just joking... haha .. he havent went through puberty so he have such a ''Amazing'' Voice..
he better have not