0.5 Hz (SIGMA/2^8 = 0.492s, ≈0.508 Hz): Deep sleep delta range. Enhances parasympathetic tone. Base: 126/64 = 1.97s → 0.508 Hz.
1.0 Hz (SIGMA/2^7 = 0.984s, ≈1.016 Hz): Heartbeat resonant. SA node intrinsic ~1 Hz. Base: 126/128 = 0.984s.
2.0 Hz (SIGMA/2^6 = 1.97s, ≈0.508 Hz ... wait): Actually 126/63 = 2s → 0.5 Hz. The d=63 divisor unit. Neural slow tier. HRV and gastric rhythms.
4.1 Hz (SIGMA/2^9 = 0.246s, ≈4.06 Hz): Theta EEG boundary. Meditation and light sleep.
8.1 Hz (SIGMA/2^10 = 0.123s, ≈8.13 Hz): Alpha EEG. Relaxed wakefulness. Close to Schumann fundamental (7.83 Hz).
126 Hz (SIGMA/1 for acoustic): Acoustic Z6 fundamental. For speaker-based delivery. Cellular stimulation range.