Sine is the purest tone — a single frequency with no overtones. Triangle, square and sawtooth add harmonics, useful for demonstrating timbre and how the body distinguishes texture in sound.
Resolving & unresolving chords
Four-chord progressions built in the key you select above — tonic A4. Each chord lasts one second; follow the arc from home, through tension, to resolution or suspension.
Set the carrier to a musical pitch, or fine-tune it in Hz below. The beat is added and subtracted around it.
Brainwave presets
Solfeggio & healing frequencies
Chakras · ascending scale
The seven centres mapped to the rising musical scale — C at the root up to B at the crown — so pitch climbs as you move up the body. Shown at standard tuning (A = 440 Hz).
Five Elements · meridians (五音)
The classical Chinese five-tone system (wŭ yīn), where each of the five elements carries a tone and governs a pair of acupuncture meridians. Shown at standard tuning (A = 440 Hz).