This sounds exactly like the audio synthesis I did for a recent generative sound app. I didn't know too much so a very high q band pass filter over brown noise

This sounds exactly like the audio synthesis I did for a recent generative sound app. I didn't know too much so a very high q band pass filter over brown noise did the trick. Do that over several voices (not necessarily harmonic) and you get something similar. Check it out: https://apps.apple.com/us/app/night-shapes/id1490540845 https://apps.apple.com/us/app/night-shapes/id1490540845