This app provides volume button customizations for music apps. It can be customized for each screen on/off/lock. Support actions * Normal volume operation * Next track * Previous track * Play / Pause * Pause * Stop Note If the current volume level is maximum or minimum, the customizations will not work, but this is Not a bug. It is as expected. Support We will keep adding features and improvements through updates, so please feel free to contact us if you have any requests.