Each frequency set is built from a real physical system — hydrogen Balmer lines, planetary orbital periods, Schumann resonances of the Earth–ionosphere cavity, quantum-mechanical energy levels — scaled into the audible range by powers of two.
The same C++17 DSP core as the VST3 plugin, compiled to WebAssembly and run in an AudioWorklet. 8 voices, sample-accurate, no server involvement after the page loads.
Every set follows the same rule: faudio = fphysical × 2N. The physical frequency is multiplied or divided by powers of 2 until it lands in the audible range. The integer N is fixed per set; the ratios between notes are preserved exactly.
Visible emission lines of atomic hydrogen — H‑α (656.3 nm), H‑β, H‑γ, H‑δ. Optical frequencies on the order of 1014 Hz, divided down by 240.
Details →Standing electromagnetic waves in the Earth–ionosphere cavity. Modes 1–7 measured at 7.83, 14.3, 20.8, 27.3, 33.8, 39.0, 45.0 Hz. Multiplied by 22 (×4) so SR1 lands at 31.32 Hz.
Details →Orbital periods of the eight planets converted to frequency and scaled up. Earth year ≈ 136.1 Hz (Cousto's "cosmic octave" reference, near C♯ in 12-TET).
Details →Linear ladder of energy eigenvalues. Transitions are integer multiples of ω, so the resulting tuning is harmonically pure — no inharmonicity.
Details →Anharmonic oscillator for a diatomic bond. Energy spacings shrink as n increases and converge on the dissociation limit De — keys above that point are silent.
Details →Infinite square well. Energies grow as n2, so frequency intervals widen with every step — the opposite of equal temperament's logarithmic spacing.
Details →Both tiers ship every frequency set, every waveform, every filter — same DSP. Free caps cumulative play time at 20 minutes per 24 hours and runs in the browser only. The $39 license removes the cap and unlocks the VST3 plugin.