Resonance Meditation begins with your own voice. Hum or sing a comfortable tone for twelve seconds and the app recognizes your note. It then tunes the whole session to it: the base tone, its harmonies, the binaural layer and the breathing rhythm. Everything happens on your phone. Your voice is analyzed on the device and never leaves it. There is no account, no ads and no tracking, and the app has no internet permission. What you can do About the sound All tones are tuned to A = 432 Hz.