How can I visualize microphone input (volume) in real time?

Hey folks, moderately experienced Unity programmer here. I know very little about audio, however, and I'm trying to create some simple visualizations using the microphone from the Oculus rift (eg. if you blow into the microphone, bubbles are blown onto the screen, if you blow harder, more bubbles come out).

Can anybody suggest some tutorials or point me in the direction of a solution? I can whistle a tune, but otherwise I'm a complete ignoramus about audio.

Thanks in advance,

--Rev