It helps to stand against a well-lit blank wall of a contrasting color.
Source on Github.
waveform
sequence
spectrum
Edge-detection is applied to an image from your camera, and the result is used as a waveform:
Gentle profiles produce gentle tones / jagged profiles produce jagged tones.
Edge-detection is applied to an image from your camera, and the result defines a tone sequence:
A diagonal down and to the right will produce a descending run.
Edge-detection is applied to an image from your camera, and the result defines a spectrum of sound:
As you move to the right, higher harmonics will be introduced.