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I know, I know, I have some kind of severe ascii fluid sim addiction but I'm trying to build the once-and-for-all version and god damn this shit lookin good.

Heeey, could you maybe use audio waveforms as input for this? If this is not your interest I'll keep an eye out for any kind of release or OSS; this looks quite cool

which is to say I'm open to hearing good ideas so I can steal them

First thing I'd try is just using amplitude to affect the movement of your main point — like, with silence it just tools along slowly left to right, loops back when it leaves the frame (same angle). Then greater audio amplitude = speed up, and with any big pulse, change angle (either direction)

... hope this makes sense! I'm assuming the video is reacting to mouse pointer mvmt; instead the audio would influence a point that's always moving. Beat detection is also pretty doable (easier than frequency detection) so you could also tie color changes to beats, or have other variables to pop