depth is a modulation index for an envelope, Hz for a centroid. Each bound is MODEL’s,
None where the window leaves or refutes MODEL’s lone modulation.
Each band’s energy through four one-poles at 200 Hz before bands decimates it to 2 kHz:
a tone’s ripple at twice its frequency, near a multiple of 2 kHz, would alias onto a slow
modulation, and falls some 78 dB by 1.92 kHz, while a 20 Hz modulation keeps 98%.