energies · XIX / XX · Sphere D · Depth & Integration · All 20

Five tools. Sound that works.

200 hertz in the left ear, 210 in the right. The difference sits in the alpha range. Five sound tools, generated right in the browser: no files, no tracking. And what only tradition claims gets called exactly that here.

Resonance Studio · 5 tools

Alpha · 10 Hz

Binaural Beat

200 Hz left, 210 Hz right. Difference = 10 Hz, alpha range. Put on headphones. Meta-analysis (Garcia-Argibay 2019, 22 studies): small but consistent effect on attention.

3-10 Min · 📐

220 Hz + Harmonics

Singing bowl

Tibetan singing-bowl frequency with natural overtones. Goldsby 2017 (RCT, n=62): significant for stress & mood (d=0.6-0.8). Replicated 2023.

2-5 Min · 📐🌀

528 Hz

Solfeggio · 528 Hz

The most popular Solfeggio frequency. Claims about DNA repair are not peer-reviewed. What works: any calming music calms HRV. That is established.

5 Min · 🌀

C3 + G3

Om · Drone

Deep drone from two sine tones (C3 + G3 · perfect fifth). Slows breathing. Telles et al. 2019 (RCT): regular om-practice reduces HRV LF/HF ratio.

10+ Min · 📐🌀

1/f Spectrum

Pink Noise

1/f noise (natural acoustic carpet) helps with falling asleep and concentration. Suzuki 2017 (RCT, n=13): deeper sleep phases, improved memory consolidation.

unlimited · 📐

If you listen with headphones: keep the volume comfortable. If you have tinnitus or hearing sensitivity: test briefly and decide. These tools are not a substitute for therapy.

armarium instrumentorum · beyond the browser

Seven tools. A single mechanism.

What you hear above with the Web Audio API, humans have practised for millennia with physical sound. Each of these tools uncouples the body from the beta-waking mode and leads it into measurable HRV coherence.

1. Tuning fork

furca tonalis · 1711, John Shore

Pure sine tone, felt in the body. Frequency therapy uses it at acupuncture points. Small but replicated.

Beaulieu 2010 2. ### Chladni plate

tabula vibrans · 1787

Sand on a vibrating plate forms geometric patterns per frequency. Makes visible that vibration is form.

Chladni · Hans Jenny 3. ### Headphones

cochlea isolata · stereo

Binaural hearing only works in stereo isolation. Over-ear > in-ear for binaural effects.

Lavallee 2011 4. ### HRV sensor

variatio cordis · objectiva

Heart rate variability, the objective measure of autonomic balance. Sound practice raises HRV coherence.

McCraty 2015 5. ### Pendulum

sympathia oscillans · 1665

Two pendulums of equal frequency synchronise via wall coupling. Huygens’ original finding.

Huygens 1665 6. ### Oscillator

fons sinūs · analog

Electronic oscillation source. Generates pure sine/square waves. The Web Audio original. Here digital, there analog.

Helmholtz · 1862 7. ### Brain-Cross

sectio cerebri · auditoria

Sagittal section through the cortex. Where sound first arrives: Brodmann 41/42, primary auditory cortex.

Brodmann 1909

1. 1 · Not peer-reviewed: DNA repair at 528 Hz. Established: that calming music calms. The more boring claim wins more often than we would like.