I found some comments on Reddit that proposed:<p>&gt; It&#x27;s probably a channel dedicated to a paint-2-sound generator. Example (that&#x27;s very old software: Coagula). Pixels actually represent the spectrum over time (X), and the color intensity the magnitude at frequency (Y)<p>&gt;<p>&gt; But what is its purpose?<p>&gt;<p>&gt; Synthesize mouth-like sounds. Anyway that&#x27;s just an hypothesis. But the pseudo of the guy matches to something in the domain, aka the sampling theorem (unfavorable semi sircle: full circle = full spectrum = 2PI, but in sound over 1PI = nyquist frequency, there&#x27;s the folding phenomena).