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"Once you have measured your ears through Aumeo’s app AumeoHub, your audio profile will have been uploaded to Aumeo, the device and the sound will automatically be tailored to your ears.To toggle the tailoring effect, press the flat part of the volume dial like a button. When the Aumeo effect is on and sound is tailored to your ears, 6 lights glow white when the volume dial is pressed. When the Aumeo effect is off, 3 lights will glow red when pressed."
<https://aumeoaudio.com/support/>