Music-reactive visuals are most convincing when they feel like a property of the world, not an overlay. This experiment maps a smoothed spectrum into Niagara parameters and material emissive values.
Build for readability
I used three broad frequency bands instead of a dense spectrum. Low frequencies move large forms, mids alter local density, and highs add brief sparks. The result reads at a glance and stays cheap to evaluate.
A gentle response
Raw audio data jitters. A short attack and a longer release give the effect intent, especially when several systems share the same signal.