How can I run input audio into this script?

Hey there, im running this oscilloscope looking processing script from:
Im having difficulty understanding how to get it to make proper shapes. Right now im basically getting the white canvas with a flat line like:
I have the mic turned on and the minim library installed. Maybe it needs audio in instead of the mic? How would I go about that? Im sure the answer is fairly obvious here, I just cant figure it out.
Thanks :)

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