Step 1: Install the Rocker Locker app
Rocker Locker is a cool app that allows you to custom volume buttons and control media volume by default. It is available on the Google Play Store for free and does not require root access for it to work.Download Rock Locker from the Google Play Store
Step 2: Enable the app service
There is no rocket science behind the Rocker Locker app – Simply tap on “Enable” to launch the app service. Once enabled, Rocker Locker will ensure that every time you use the volume buttons, it control media volume and not the ringer volume.Source: WonderHowTo
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