With this app, you can start a notification through which you can control the music or ringer volume, without using the hardware buttons of your device.

You can select which volumes you want to control through it: Music Volume or Ringer volume, or both.
The notification's icon appears in the notification bar. Drag the notification bar open to see the full notification.

For more info see the help in the app.

Notes: 
-On tablets with no telephony support, the Ringer controls will not work. In some devices, these controls will change the Notifications volume.
-In order for the notification to appear, notifications must be enabled for the app, through its settings.