How Do You Know if You Can't See a Sound Wave?

When you plug a microphone in, it sends those sound waves through a wire that will then be interpreted by the computer and actually draw a picture of what's recording or what you're hearing. So would your voice look different from my voice? Yes. Because a lower voice or a higher voice, the more a sound vibrates. But something very high pitched, if you think of like, you know, the thin string on a guitar, that vibrates faster than the big.