I know that you can do an audio spectrum using a shape and a mask over the background, but I would like to know if it's possible to make the audio spectrum move automatically like the light effect in this tutorial : Elegant Light Streaks (No Third Party Plugins) | After Effects Tutorial - YouTube
I tried to put a mask over my particles effect or my nul object, but it doesn't work. Do I need to do everything by hand to make my line move? Can I use a wiggle on my shape?
I'm not quite sure I follow you but from what I gather, you could add a Separate X,Y,Z effect to your null controller and then apply a wiggle to one of the co-ordinates, perhaps with a slider controller so you have some control over the wiggle...