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The volume of your Android phone is not a monolithic setting—there's media, ringtone, notifications, alarms, and more. Changing the right one at the right time can be annoying, but Volume Notifications can help. It's a simple app that gives you two ways to quickly access specific volume controls.
All devices can run Volume Notification as a notification, as the name would imply. That means it shows up as an item in the notification shade, but the location and style of that notification can be controlled from the app's settings. The main screen of those settings includes a list of volume types, which you can rearrange and enable/disable as you like. These control which shortcuts appear in the notification version of Volume Notification.
You should also check out the full settings for this app, which allow you to tweak the performance of several of the buttons. For example, the default behavior when you press the buttons is to bring up a slider to control that particular volume setting. If you prefer, you can have the media or ring buttons simply toggle mute when you press them. The theme of the notification can be changed as well.
When you're using the notification version of the app, you might also want to check the notification priority settings. The app can be set to produce a status bar icon, which keeps it at the top of your list. I think it looks nicer when you have the notification shade open to have Volume Notification at the top. That way you can theme it to match your phone's settings UI.
Your other option for using Volume Notification requires Android 7.0 or higher. With Nougat, you can modify the quick settings on your phone and add third-party tiles. Installing Volume Notification adds the tiles to your list automatically. Simply open the editing UI and drag the tiles up into your quick settings. These tiles operate the same way as the notification—tap to get a popup volume slider.
Volume Notification is not a complex app, but it could potentially fix a big pain point when using your phone. It doesn't hurt that it costs absolutely nothing.