Map the low-mid band to organic warp/flow depth so the field swells and eddies with the music's body

In the organic style, the reactivity target is the low-mid frequency band (a.fft[1]), which corresponds to the melodic and harmonic body of most music — not the click of high-frequency transients nor the pure sub of the bass. Mapping this band to the warp or flow depth parameter causes the domain-warp amount to increase as musical energy builds in the body frequencies, making the field swell and eddy. This is reactive but not percussive: the change is smooth and sustained, appropriate to the organic style. Heavy smoothing (a.setSmooth with a high value) is required so that the amplitude envelope is followed rather than individual transients, keeping the organic feeling alive.

Examples

Hydra: noise(3,0.1).modulate(noise(2,()=>0.1+a.fft[1]*0.4),0.3).out() — the modulation depth rises with the low-mid band, swelling the warp when the music’s body swells.

Assessment

Explain why low-mid (a.fft[1]) rather than bass (a.fft[0]) is the preferred reactivity source for organic visuals, and describe the smoothing setting (high or low a.setSmooth?) required to keep the organic feeling.