There’s a lot of ways to do this. Processing is great for developing your own code. TouchDesigner is better for 3D tho 
@VoidState ¯_(ツ)_/¯
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I’ve made a few little things with processing like pixel shifting images and generative systems. The interface in Touch Designer is really appealing.
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Kia ora! FYI Heaps of good tuts for sound viz on the derivative.ca website … also this fellas has compiled just about all English tutorials into on place … https://alltd.org/ 
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Milkdrop ring a bell to anyone? Was part of WinAmp.
I’ve still got it somewhere on a windows machine and might have a standalone .exe of it, needs a screen recorder like FRAPS or similar. Anyone else used it for generative visualisation?
i was looking into this subject of visuals syncing with sound…
theres a real neat demo of Magic Music Visuals which is a very well made application on the PC, which utilises the graphics card for realtime manipulation of visuals either via midi CC’s/notes etc but can also sync to a frequency spectrum…
Its very easy to understand, and uses a modular method of handling visuals… which should be very intuitive for modular based synth people out there…
heres a 6yr old video of a user showing the application… in the video he toggles the modules on/off to step through the visual sequence that he has created to give the basis of how the application works.
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Boom…
https://magicmusicvisuals.com/
There it is, PC or MAC, I will grab the demo and see how it goes - chur!
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i made a quick demo using Magic Music Visuals, the music is a trackerMod from the Amiga ERA
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I haven’t… but live winamp !