I created this Max patch as a test for sound reactive visuals. I use jitter physics to give the balls mass in the virtual world and then map ghost objects at the bottom of the world to impulse based on the sound coming in or out of the computer. I use the fffb object to separate the left and right audio channels into different bands which correspond to the ghost objects that send out impulses to move the balls. That way instead of just flying all over the place the direction the balls move directly corresponds to how much bass or treble is in the music and which channel it’s coming from. The song is by my friend Ula from Poland. It was an ideal choice for the test as it has a dynamic range.
Here is the patch being used to do visuals at a show.