Firstly, you have to make sure there is a mic and a webcam plugged in your computer and once you've done that, follow these simple instructions. 1) Firstly plug in mic and webcam (as shown above) 2) Press the green flag 3) Make noises (blow or speak) in microphone 4) Watch the sound waves on the screen.
(i have found my mic) Enjoy!! I give credit to @CombatBirds for the idea! You can see your self looking at the waves on-screen!! Faster version: http://phosphorus.github.io/#56943716