The app lets you control volume in two ways:
 Slider |  Buttons |
By default, volume is controlled by the slider, but it's easy to change to buttons.
Changing the volume control between slider or buttons
- From the Home Screen of your product, select Settings (
) - Select Other Settings
- Select Volume control
- Make your choice in the pop-up
Note: you may have to reopen the app to see the changed volume control