Customize headphone audio levels on your iPhone or iPad - Apple

Amplify soft sounds and tune audio for your hearing needs.

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No Headphones Audio Level on Hearing Cont… - Apple Community

Customize Headphone Audio Levels On Your IPhone Or IPad Apple

Headphone notifications on your iPhone, iPod touch or Apple Watch - Apple Support (CA)

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Make a recording in Voice Memos on iPad - Apple Support

iPhone volume drops and raises on its own… - Apple Community