How to control the volume in iOS
Most of the time, you hit a volume button on your iPhone, iPod touch, or iPad, and it does what you expect, whether it’s turning up your reminder alarms or turning down your music. And then there are the other times.
But once you understand the different “kinds” of sounds, the interaction between software settings and the volume buttons, and how context overrides the default course of events, you’ll have better control over your device's volume.
The sound of more than music
The key to mastering volume adjustment is understanding that most of the sounds on your device fall into one of two categories. General audio includes music and other media, and the voice volume on the iPhone and for FaceTime on all devices. The “ringers and alerts” category includes not only the iPhone ringer, but also: FaceTime rings; Clock app alarms; notifications and individual app alerts; keyboard clicks; and miscellaneous app sounds like the whoosh of sending Mail.
Basically, you can decide which kind of sounds—general audio or the ringers and alerts—your volume buttons control by going to Settings > Sounds and, under Ringers and Alerts, set Change With Buttons to On or Off; if you turn it off, the buttons control the general audio. But your default choice is easily, and often, overridden because what you’re doing at any given moment takes precedence over the default settings
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