To have the most successful hearing profile set by the otoTune app, we recommend you take the hearing test in a quiet environment. The otoTune app will also estimate the noise level in the room before the test. During the hearing test press the right or left button only when you hear a sound on the corresponding side. If you miss a tone or thought you heard one and/or did not press the button, otoTune will account for this in the results.