Glide audio bands instead of strobing with an attack and release you can tune.
Run it per band, every frame, feeding the previous result back in. A higher fall keeps energy lingering; raise rise to snap on transients.
float smoothBand(float now, float last, float rise, float fall) {
float k = now > last ? rise : fall;
return mix(last, now, k);
}A tiny onset gate with adjustable decay for snapping events into motion.
function js audio-reactivebeatBucket a raw FFT array into a few stable, normalized bands you can actually use.
snippet js audio-reactivefftutilityWhen to smooth, what to ease, and where raw audio usually causes visual noise.
write-up smoothingeasing