In the 4-bin rig, audio bands can drive color brightness, saturation, or palette phase but not onset-triggered color events

The current rig provides four FFT bins (bass/low-mid/high-mid/highs). These can be mapped to color parameters: bass (a.fft[0]) to brightness or value, highs (a.fft[3]) to hue rotation or palette phase — using the audio-reactive-map and spectral-band-split patterns. What is NOT available in this rig: onset-triggered color flashes (where a single hit event fires a color burst) and loudness/RMS-based color grading. Both require audio features the rig does not extract; they should be marked not-yet-possible rather than approximated.

Examples

Map a.fft[0] to the brightness parameter of a palette so bass hits visibly pulse the luminance while highs rotate the hue.

Assessment

List two color parameters mappable to the 4-bin rig and name two color reactivity patterns that are not-yet-possible, explaining why each is blocked.