Some experiments with OsciStudio. The first animation is based on an animation by BeesandBombs.
The visuals you see are made by "drawing" with the left audio channel as one coordinate and the right audio channel as the other. The video can be generated just by plugging the audio into an oscilloscope or oscilloscope emulator.
Created using dood.al/oscilloscope, Garageband, socalabs.com/developer-tools/maths and iShowU Audio Capture.