Tone

Tone is a signal generator. Six waveforms, from 20 Hz to 20 kHz, and a button to make them sound. • Sine, square, triangle, sawtooth, white noise and pink noise • Frequency on a logarithmic dial — an octave takes the same distance low and high — plus two buttons that move by a **semitone**, because ten hertz is an octave at the bottom of the scale and nothing at the top • Level on a decibel taper: the whole travel of the slider is useful, instead of being spent on sounds that all seem equally loud • The wave drawn on screen while it plays: the only honest sign that it really is playing The app opens **silent**, always. An app that makes a noise the moment it is opened is an app uninstalled the moment it is opened. What it is for: testing a speaker or a pair of headphones, hunting a hum, checking a tuner, masking an annoying noise with pink noise, or finding out where your hearing stops. What Tone does not do: • no account, no sign-up • **no permissions**: it listens to nothing, does not know where you are, and has no camera to ask for • no audio files in the package: every sample is computed on the phone A word of care: a steady tone at a high level in headphones is louder than it seems. The app says so when you turn it up. Privacy policy: https://mindcontact.app/mcma-tone/privacy/