When you hear your voice via recording, the happening event is that air molecules that surround the recording are excited and start to vibrate. The vibrations reach your eardrum wherein your ear the vibrations are transferred into electromagnetic waves (nerve messages) that reach your brain and you perceive your voice. When you speak the voice are coming from two ways, the first way is from your mouth vibrating air to your ear. The second way, when your vocal cords vibrate they cause the skull to vibrate. Thus, the combination of the sound wave traveled by the bones with the sound wave traveled in the air makes your voice such that its frequency decreases(lower pitch). What you hear in a recording is your real voice.
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